Since no firstrank constant has been stored for this game, one will be calculated by analyzing the moves in the game. This will work only if the game lasted long enough to put enough pieces into play.

mv is P d2-d4, p is P, o is d2

space d2 is P

0 P P d2-d4 27 61 59 61 59 61 59 29

11011 111101 111011 111101 111011 111101 111011 11101

mv is g7-g6, p is #p, o is g7

space g7 is p

1 p g7-g6 27 61 59 61 59 61 59 29

11011 111101 111011 111101 111011 111101 111011 11101

mv is P e2-e4, p is P, o is e2

space e2 is P

2 P P e2-e4 27 61 59 61 59 61 59 29

11011 111101 111011 111101 111011 111101 111011 11101

mv is f8-g7, p is #p, o is f8

space f8 is f1

3 f1 f8-g7 27 61 59 61 59 61 59 29

11011 111101 111011 111101 111011 111101 111011 11101

5 one bits in var f1

11011 111101 111011 111101 111011 110100 111011 11101

q end f8-g7 27 61 59 61 59 52 59 29

bb end f8-g7 27 61 59 61 59 52 59 29

bw end f8-g7 27 61 59 61 59 52 59 29

firstr is a1, and lastr is h1

r f8-g7 27 61 59 61 59 52 59 29

first 27 61 59 61 59 52 59 29

mv is N g1-f3, p is N, o is g1

space g1 is g1

4 g1 N g1-f3 27 61 59 61 59 52 59 29

11011 111101 111011 111101 111011 110100 111011 11101

5 one bits in var g1

11011 111101 111011 111101 111011 110100 1 11101

q end N g1-f3 27 61 59 61 59 52 1 29

bb end N g1-f3 27 61 59 61 59 52 1 29

bw end N g1-f3 27 61 59 61 59 52 1 29

firstr is a1, and lastr is h1

r N g1-f3 27 61 59 61 59 52 1 29

first 27 61 59 61 59 52 1 29

mv is d7-d6, p is #p, o is d7

space d7 is p

5 p d7-d6 27 61 59 61 59 52 1 29

11011 111101 111011 111101 111011 110100 1 11101

mv is N h1-g3, p is N, o is h1

space h1 is h1

6 h1 N h1-g3 27 61 59 61 59 52 1 29

11011 111101 111011 111101 111011 110100 1 11101

4 one bits in var h1

11011 111101 111011 111101 111011 110100 1 1

q end N h1-g3 27 61 59 61 59 52 1 1

bb end N h1-g3 27 61 59 61 59 52 1 1

bw end N h1-g3 27 61 59 61 59 52 1 1

firstr is a1, and lastr is e1

r N h1-g3 27 61 59 61 27 20 1 1

first 27 61 59 61 27 20 1 1

11010 111100 111010 111100 11010 10100 1 1

q end N h1-g3 26 60 58 60 26 20 1 1

bb end N h1-g3 26 60 58 60 26 20 1 1

bw end N h1-g3 26 60 58 60 26 20 1 1

firstr is a1, and lastr is e1

r N h1-g3 26 60 58 60 26 20 1 1

first 26 60 58 60 26 20 1 1

mv is g8-f6, p is #p, o is g8

space g8 is g1

7 g1 g8-f6 26 60 58 60 26 20 1 1

11010 111100 111010 111100 11010 10100 1 1

1 one bits in var g1

11010 111100 111010 111100 11010 10100 1 1

q end g8-f6 26 60 58 60 26 20 1 1

bb end g8-f6 26 60 58 60 26 20 1 1

bw end g8-f6 26 60 58 60 26 20 1 1

firstr is a1, and lastr is e1

r g8-f6 26 60 58 60 26 20 1 1

first 26 60 58 60 26 20 1 1

mv is B f1-d3, p is B, o is f1

space f1 is f1

8 f1 B f1-d3 26 60 58 60 26 20 1 1

11010 111100 111010 111100 11010 10100 1 1

2 one bits in var f1

11010 111100 111010 111100 11010 100 1 1

q end B f1-d3 26 60 58 60 26 4 1 1

bb end B f1-d3 26 60 58 60 26 4 1 1

bw end B f1-d3 26 56 58 56 26 4 1 1

firstr is a1, and lastr is e1

r B f1-d3 26 56 58 56 26 4 1 1

first 26 56 58 56 26 4 1 1

11010 111000 111010 111000 11010 100 1 1

q end B f1-d3 26 56 58 56 26 4 1 1

bb end B f1-d3 26 56 58 56 26 4 1 1

bw end B f1-d3 26 56 58 56 26 4 1 1

firstr is a1, and lastr is e1

r B f1-d3 26 56 58 56 26 4 1 1

first 26 56 58 56 26 4 1 1

mv is e7-e5, p is #p, o is e7

space e7 is p

9 p e7-e5 26 56 58 56 26 4 1 1

11010 111000 111010 111000 11010 100 1 1

mv is P d4-e5, p is P, o is d4

space d4 is P

10 P P d4-e5 26 56 58 56 26 4 1 1

11010 111000 111010 111000 11010 100 1 1

mv is d6-e5, p is #p, o is d6

space d6 is p

11 p d6-e5 26 56 58 56 26 4 1 1

11010 111000 111010 111000 11010 100 1 1

mv is N f3-e5, p is N, o is f3

space f3 is g1

12 g1 N f3-e5 26 56 58 56 26 4 1 1

11010 111000 111010 111000 11010 100 1 1

1 one bits in var g1

11010 111000 111010 111000 11010 100 1 1

q end N f3-e5 26 56 58 56 26 4 1 1

bb end N f3-e5 26 56 58 56 26 4 1 1

bw end N f3-e5 26 56 58 56 26 4 1 1

firstr is a1, and lastr is e1

r N f3-e5 26 56 58 56 26 4 1 1

first 26 56 58 56 26 4 1 1

mv is f6-g4, p is #p, o is f6

space f6 is g1

13 g1 f6-g4 26 56 58 56 26 4 1 1

11010 111000 111010 111000 11010 100 1 1

1 one bits in var g1

11010 111000 111010 111000 11010 100 1 1

q end f6-g4 26 56 58 56 26 4 1 1

bb end f6-g4 26 56 58 56 26 4 1 1

bw end f6-g4 26 56 58 56 26 4 1 1

firstr is a1, and lastr is e1

r f6-g4 26 56 58 56 26 4 1 1

first 26 56 58 56 26 4 1 1

mv is N e5-g4, p is N, o is e5

space e5 is g1

14 g1 N e5-g4 26 56 58 56 26 4 1 1

11010 111000 111010 111000 11010 100 1 1

1 one bits in var g1

11010 111000 111010 111000 11010 100 1 1

q end N e5-g4 26 56 58 56 26 4 1 1

bb end N e5-g4 26 56 58 56 26 4 1 1

bw end N e5-g4 26 56 58 56 26 4 1 1

firstr is a1, and lastr is e1

r N e5-g4 26 56 58 56 26 4 1 1

first 26 56 58 56 26 4 1 1

mv is c8-g4, p is #p, o is c8

space c8 is c1

15 c1 c8-g4 26 56 58 56 26 4 1 1

11010 111000 111010 111000 11010 100 1 1

4 one bits in var c1

11010 111000 10010 111000 11010 100 1 1

q end c8-g4 26 56 18 56 26 4 1 1

bb end c8-g4 26 56 18 56 26 4 1 1

bw end c8-g4 26 56 18 56 26 4 1 1

firstr is a1, and lastr is e1

r c8-g4 26 56 18 56 26 4 1 1

first 26 56 18 56 26 4 1 1

mv is B d3-e2, p is B, o is d3

space d3 is f1

16 f1 B d3-e2 26 56 18 56 26 4 1 1

11010 111000 10010 111000 11010 100 1 1

1 one bits in var f1

11010 111000 10010 111000 11010 100 1 1

q end B d3-e2 26 56 18 56 26 4 1 1

bb end B d3-e2 26 56 18 56 26 4 1 1

bw end B d3-e2 26 56 18 56 26 4 1 1

firstr is a1, and lastr is e1

r B d3-e2 26 56 18 56 26 4 1 1

first 26 56 18 56 26 4 1 1

mv is g4-c8, p is #p, o is g4

space g4 is c1

17 c1 g4-c8 26 56 18 56 26 4 1 1

11010 111000 10010 111000 11010 100 1 1

2 one bits in var c1

11010 111000 10010 111000 11010 100 1 1

q end g4-c8 26 56 18 56 26 4 1 1

bb end g4-c8 26 56 18 56 26 4 1 1

bw end g4-c8 26 56 18 56 26 4 1 1

firstr is a1, and lastr is e1

r g4-c8 26 56 18 56 26 4 1 1

first 26 56 18 56 26 4 1 1

mv is Q c1-g5, p is Q, o is c1

space c1 is c1

18 c1 Q c1-g5 26 56 18 56 26 4 1 1

11010 111000 10010 111000 11010 100 1 1

2 one bits in var c1

11010 111000 10000 111000 11010 100 1 1

queen before Q c1-g5 26 56 16 56 26 4 1 1

queen after Q c1-g5 10 40 16 40 10 4 1 1

q end Q c1-g5 10 40 16 40 10 4 1 1

bb end Q c1-g5 10 40 16 40 10 4 1 1

bw end Q c1-g5 10 40 16 40 10 4 1 1

firstr is a1, and lastr is e1

r Q c1-g5 10 40 16 40 10 4 1 1

first 10 40 16 40 10 4 1 1

1010 101000 10000 101000 1010 100 1 1

q end Q c1-g5 10 40 16 40 10 4 1 1

bb end Q c1-g5 10 40 16 40 10 4 1 1

bw end Q c1-g5 10 40 16 40 10 4 1 1

firstr is a1, and lastr is e1

r Q c1-g5 10 40 16 40 10 4 1 1

first 10 40 16 40 10 4 1 1

mv is d8-d1, p is #p, o is d8

space d8 is d1

19 d1 d8-d1 10 40 16 40 10 4 1 1

1010 101000 10000 101000 1010 100 1 1

2 one bits in var d1

rook ride

d1 currently set to 40

d1 now set to 8

1010 101000 10000 1000 1010 100 1 1

Array
(
    [0] => a1
)

q end d8-d1 8 32 16 8 2 4 1 1

bb end d8-d1 8 32 16 8 2 4 1 1

bw end d8-d1 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end d8-d1 8 32 16 8 2 4 1 1

bb end d8-d1 8 32 16 8 2 4 1 1

bw end d8-d1 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is B e2-d1, p is B, o is e2

space e2 is f1

20 f1 B e2-d1 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var f1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end B e2-d1 8 32 16 8 2 4 1 1

bb end B e2-d1 8 32 16 8 2 4 1 1

bw end B e2-d1 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is c8-d7, p is #p, o is c8

space c8 is c1

21 c1 c8-d7 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end c8-d7 8 32 16 8 2 4 1 1

bb end c8-d7 8 32 16 8 2 4 1 1

bw end c8-d7 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is B d1-g4, p is B, o is d1

space d1 is f1

22 f1 B d1-g4 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var f1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end B d1-g4 8 32 16 8 2 4 1 1

bb end B d1-g4 8 32 16 8 2 4 1 1

bw end B d1-g4 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is f7-f6, p is #p, o is f7

space f7 is p

23 p f7-f6 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

mv is Q g5-f4, p is Q, o is g5

space g5 is c1

24 c1 Q g5-f4 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end Q g5-f4 8 32 16 8 2 4 1 1

bb end Q g5-f4 8 32 16 8 2 4 1 1

bw end Q g5-f4 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is d7-b5, p is #p, o is d7

space d7 is c1

25 c1 d7-b5 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end d7-b5 8 32 16 8 2 4 1 1

bb end d7-b5 8 32 16 8 2 4 1 1

bw end d7-b5 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is R a1-d1, p is R, o is a1

space a1 is a1

26 a1 R a1-d1 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var a1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end R a1-d1 8 32 16 8 2 4 1 1

bb end R a1-d1 8 32 16 8 2 4 1 1

bw end R a1-d1 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is a7-a5, p is #p, o is a7

space a7 is p

27 p a7-a5 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

mv is R d1-d8, p is R, o is d1

space d1 is a1

28 a1 R d1-d8 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var a1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end R d1-d8 8 32 16 8 2 4 1 1

bb end R d1-d8 8 32 16 8 2 4 1 1

bw end R d1-d8 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is b8-a7, p is #p, o is b8

space b8 is b1

29 b1 b8-a7 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var b1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end b8-a7 8 32 16 8 2 4 1 1

bb end b8-a7 8 32 16 8 2 4 1 1

bw end b8-a7 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is Q f4-c7, p is Q, o is f4

space f4 is c1

30 c1 Q f4-c7 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end Q f4-c7 8 32 16 8 2 4 1 1

bb end Q f4-c7 8 32 16 8 2 4 1 1

bw end Q f4-c7 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is f6-f5, p is #p, o is f6

space f6 is p

31 p f6-f5 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

mv is R d8-a8, p is R, o is d8

space d8 is a1

32 a1 R d8-a8 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var a1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end R d8-a8 8 32 16 8 2 4 1 1

bb end R d8-a8 8 32 16 8 2 4 1 1

bw end R d8-a8 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is a7-a8, p is #p, o is a7

space a7 is b1

33 b1 a7-a8 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var b1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end a7-a8 8 32 16 8 2 4 1 1

bb end a7-a8 8 32 16 8 2 4 1 1

bw end a7-a8 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is Q c7-g7, p is Q, o is c7

space c7 is c1

34 c1 Q c7-g7 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end Q c7-g7 8 32 16 8 2 4 1 1

bb end Q c7-g7 8 32 16 8 2 4 1 1

bw end Q c7-g7 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is h8-f7, p is #p, o is h8

space h8 is h1

35 h1 h8-f7 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var h1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end h8-f7 8 32 16 8 2 4 1 1

bb end h8-f7 8 32 16 8 2 4 1 1

bw end h8-f7 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is P e4-f5, p is P, o is e4

space e4 is P

36 P P e4-f5 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

mv is f7-e5, p is #p, o is f7

space f7 is h1

37 h1 f7-e5 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var h1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end f7-e5 8 32 16 8 2 4 1 1

bb end f7-e5 8 32 16 8 2 4 1 1

bw end f7-e5 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is B g4-e2, p is B, o is g4

space g4 is f1

38 f1 B g4-e2 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var f1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end B g4-e2 8 32 16 8 2 4 1 1

bb end B g4-e2 8 32 16 8 2 4 1 1

bw end B g4-e2 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is e5-c4, p is #p, o is e5

space e5 is h1

39 h1 e5-c4 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var h1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end e5-c4 8 32 16 8 2 4 1 1

bb end e5-c4 8 32 16 8 2 4 1 1

bw end e5-c4 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is B e2-c4, p is B, o is e2

space e2 is f1

40 f1 B e2-c4 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var f1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end B e2-c4 8 32 16 8 2 4 1 1

bb end B e2-c4 8 32 16 8 2 4 1 1

bw end B e2-c4 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is b5-c4, p is #p, o is b5

space b5 is c1

41 c1 b5-c4 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end b5-c4 8 32 16 8 2 4 1 1

bb end b5-c4 8 32 16 8 2 4 1 1

bw end b5-c4 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is B e1-a5, p is B, o is e1

space e1 is e1

42 e1 B e1-a5 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var e1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end B e1-a5 8 32 16 8 2 4 1 1

bb end B e1-a5 8 32 16 8 2 4 1 1

bw end B e1-a5 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is c4-c5, p is #p, o is c4

space c4 is c1

43 c1 c4-c5 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end c4-c5 8 32 16 8 2 4 1 1

bb end c4-c5 8 32 16 8 2 4 1 1

bw end c4-c5 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is Q g7-g8, p is Q, o is g7

space g7 is c1

44 c1 Q g7-g8 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end Q g7-g8 8 32 16 8 2 4 1 1

bb end Q g7-g8 8 32 16 8 2 4 1 1

bw end Q g7-g8 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is c5-e5, p is #p, o is c5

space c5 is c1

45 c1 c5-e5 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end c5-e5 8 32 16 8 2 4 1 1

bb end c5-e5 8 32 16 8 2 4 1 1

bw end c5-e5 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is P f5-g6, p is P, o is f5

space f5 is P

46 P P f5-g6 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

mv is h7-g6, p is #p, o is h7

space h7 is p

47 p h7-g6 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

mv is B a5-c3, p is B, o is a5

space a5 is e1

48 e1 B a5-c3 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var e1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end B a5-c3 8 32 16 8 2 4 1 1

bb end B a5-c3 8 32 16 8 2 4 1 1

bw end B a5-c3 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is e5-e7, p is #p, o is e5

space e5 is c1

49 c1 e5-e7 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var c1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end e5-e7 8 32 16 8 2 4 1 1

bb end e5-e7 8 32 16 8 2 4 1 1

bw end e5-e7 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

mv is P f2-f4, p is P, o is f2

space f2 is P

50 P P f2-f4 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

mv is a8-a7, p is #p, o is a8

space a8 is b1

51 b1 a8-a7 8 32 16 8 2 4 1 1

1000 100000 10000 1000 10 100 1 1

1 one bits in var b1

1000 100000 10000 1000 10 100 1 1

Array
(
    [0] => a1
)

q end a8-a7 8 32 16 8 2 4 1 1

bb end a8-a7 8 32 16 8 2 4 1 1

bw end a8-a7 8 32 16 8 2 4 1 1

first 8 32 16 8 2 4 1 1

Continue because mv is empty

firstrank is RKQRBBNN

Castling with Rook! a1 d1 a1 d1 d1 f1

Please enable JavaScript. Game Courier makes use of JavaScript for displaying legal moves, for moving pieces by touch or mouse, for updating time clocks, and for updating the page when it is your turn again.

Viewing Game


8
7
6
5
4
3
2
1
	a	b	c	d	e	f	g	h

Fischer Random Chess

White:

Black:

26... a8-a7

Orientation:

Scale:

Render as:

Shape:

Piece Set:

Colors:

Rules of Fischer Random Chess

King

Queen

Rook

Bishop

Knight

Pawn

Fischer Random Chess is played just like Chess except as follows:

The starting position is randomized with the following restrictions:

Pawns are placed where they normally start in Chess.
All remaining White pieces go on the first rank.
The White King goes between the two Rooks.
The White Bishops are placed on opposite color squares.
The last rank is filled with Black pieces that match the White pieces file-for-file.

A player may castle once per game under the following conditions:

Unmoved: The King and the castling Rook must not have moved before in the game, including castling.
Unattacked: All of the squares between the King's initial and final squares (including the initial and final squares) must not be under attack by any opposing piece.
Vacant: All the squares between the King's initial and final squares (including the final square), and all of the squares between the Rook's initial and final squares (including the final square), must be vacant except for the King and castling Rook.

When castling, the King and Rook always go to the same spaces they would go to in FIDE Chess.

When the Rook began on the a-side of the King, they go to the spaces usual for Queen-side castling.
When the Rook began on the h-side of the King, they go to the spaces usual for King-side castling.

Notation

You should be aware that Game Courier's notation is not identical with standard Chess notation. Game Courier has been designed for general use with any of several different Chess variants, and it accordingly uses a generic system of notation. This system is described in detail in the User's Guide. Here are the basics you need to know for Chess. Move a piece by writing its present coordinate, a hyphen, and its destination coordinate. For example, "e2-e4". There is no special operator for captures. A hyphen should be used even when a piece is captured. To signal to your opponent what piece you moved, and to provide an extra bit of error checking on the move you enter, you may include Game Courier's notation for the piece before the move. For example, "P e2-e4". Note that Game Courier uses uppercase letters for White pieces and lowercase for Black pieces. Black could enter "p e7-e5" for a move but not "P e7-e5".

This preset enforces the rules. It also automates en passant and castling. To capture by en passant, just move your Pawn to its destination. If it is a legal en passant move, your opponent's Pawn will be automatically captured.

To castle, move either your King or your Rook, but not both, to where it must go to castle. This move should be an otherwise illegal move. Either the King should move two or more spaces, or the King or Rook should hop over or capture the other. If you move your King only one space or move your Rook only across empty spaces, then your move will not count as castling. Once you have made half the castling move, the other piece will automatically move into place.

All promotions must be done explicitly. After moving your Pawn to the last rank, tack a semicolon to your Pawn move and add the new piece to the Pawn's space. For example, "P f7-f8; Q-f8".

How to Move Pieces

To enable moving by mouse or touch, you should enable JavaScript. Even without JavaScript enabled, you can still move pieces by entering your moves in the Moves field, using full algebraic notation.

Full Algebraic Notation

Algebraic notation identifies each space by a coordinate that begins with its file label and ends with its rank label. On the Chess board, files go up and down from one player to the other, and ranks go from left to right. In most games, files are represented by letters, and ranks are represented by numbers, but there is no fixed rule requiring this for all games, and some games, such as Shogi, reverse this convention. If you look at the diagram, you will usually see the file labels going from left to right and the file labels going up and down. And if you hover your mouse over a space, you will normally see the name of the coordinate appear in a tooltip.

It is not uncommon to see algebraic notation being used for Chess, but it is often in an abbreviated format that requires you to know both the rules of the game and the current position to know exactly which piece moves where. For example, the notation "Ne6" indicates that a Knight is moving to e6, but it doesn't indicate which Knight, and it doesn't specify where the Knight is coming from. To figure this out, you need to know how a Knight moves and which Knight on the board can make a legal move to e6.

Although rules may be programmed for individual games, Game Courier itself does not know the rules of any game, and it is unable to parse abbreviated algebraic notation. Therefore, it relies on full algebraic notation, which completely specifies the move without requiring any knowledge of the game's rules or the current position. The most usual type of full algebraic notation indicates the piece that is moving by its label, the space it is moving from, and the space it moving to. In Chess, a typical first move might be written as "P e2-e4". When you hover your mouse over a piece, you will normally see the piece label followed by the coordinate for the space, and when you hover it over an empty space, you will normally see the coordinate label. Including the piece label in your notation allows Game Courier to check that the piece you're moving is the right one, and it makes game notation easier to follow, but it is not mandatory.

You may promote a piece by including a promotion move after your regular move. A promotion move has a piece go directly to a coordinate. Here is an example: "p e7-e8; q-e8".

You may remove a piece from a space by adding an @ to the space or by omitting the destination coordinate. For example, both "@-e4" and "e4-" would remove the piece on "e4". This is useful for en passant when you are playing a game that does not handle this automatically. For example, "P d5-e6; e5-" removes the Pawn on e5 after a Pawn moves from d5 to e6.

You will not need to remove spaces for most games, but if you should need to, you can do this by omitting the first coordinate in a move. For example, "-e4" would remove e4 from the board. To add or return a space to the board, you may add an @ or any other piece to it.

Available Pieces

Pieces are represented by labels, usually using uppercase letters for White and lowercase letter for Black. When you enter a move or specify the starting position for a game, you should remember that piece labels are case-sensitive. Many piece sets are available for use with Game Courier, and this table shows you which pieces belong to the piece set you are currently using.

The inclusion of a piece does not indicate that it is used in the game you are playing. But if your game uses pieces not included here, you should choose a different piece set.

Credits

This preset uses the Abstract settings file for Fischer Random Chess, which was made by Fergus Duniho.

Game Courier was created, programmed and written by Fergus Duniho.

WWW Page Created: 15 August 2001

Kibbitzing Etiquette

Kibbitzing is the practice of commenting on a game you are not playing. In commenting on a game, please follow these rules of etiquette.

(1) If you notice that someone has made an illegal move, please mention it. Some Game Courier presets cannot enforce rules, but Game Courier does enable players to take back any previous move. Details on how to take back a move are provided in the User's Guide, linked to above the board.

(2) Unless otherwise specifically asked to, do not offer hints or suggestions to players on what moves they should make. In general, avoid coaching comments.

(3) Once a game is over, it should be alright to offer your analysis of the game and your specific comments on what moves players should have made. If some players don't want this, they may mention it in the Kibbitzing section, and you should honor this request by not commenting on the game.

(4) Be polite. At the appropriate time, offer any criticism you have in a constructive manner. Avoid heckling players for bad moves.

(5) Don't spam this space with irrelevant comments. If you have a comment about Game Courier, rather than about the specific game you're viewing, please post it on Game Courier's Index page to give it.