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abcdefghij
8
a8 black knight
b8 black bishop
c8 black knight
d8 black empress
e8 black queen
f8 black rook
g8 black bishop
h8 black princess
i8 black king
j8 black rook
8
7
a7 black pawn
b7 black pawn
c7 black pawn
d7 black pawn
e7 black pawn
f7 black pawn
g7 black pawn
h7 black pawn
i7 black pawn
j7 black pawn
7
6
a6
b6
c6
d6
e6
f6
g6
h6
i6
j6
6
5
a5
b5
c5
d5
e5
f5
g5
h5
i5
j5
5
4
a4
b4
c4
d4
e4
f4
g4
h4
i4
j4
4
3
a3
b3
c3
d3
e3
f3
g3
h3
i3
j3
3
2
a2 white pawn
b2 white pawn
c2 white pawn
d2 white pawn
e2 white pawn
f2 white pawn
g2 white pawn
h2 white pawn
i2 white pawn
j2 white pawn
2
1
a1 white knight
b1 white bishop
c1 white knight
d1 white empress
e1 white queen
f1 white rook
g1 white bishop
h1 white princess
i1 white king
j1 white rook
1
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Capablanca random chess. One of the 12,118 possible starting positions.

Capablanca random chess (CRC) is a chess variant invented by Reinhard Scharnagl in 2004. It combines the piece set and 10×8 board from Capablanca chess with the permutation idea of Fischer random chess (FRC or Chess960). This game won a contest in 2005 held at The Chess Variant Pages to design a variant based upon the theme of the number 10.[1]

Rules

The rules are the same as in Capablanca chess except the initial setup is randomized. White and black pieces are set up in symmetrical position. The pieces on the first rank are placed randomly with the following restrictions:

  1. Bishops must be on opposite-colored squares.
  2. The queen and the archbishop (which are composite pieces possessing, in part, the movement of bishops) must also start on opposite-colored squares.
  3. The king must be between the rooks.
  4. All pawns must be protected in the initial setup.
  5. The starting position must be different from that of Gothic chess (i.e. RNBQCKABNR).
  6. Starting positions with neighbouring bishops must be avoided.

The first restriction is taken from FRC for the purpose of balancing the power of colorbound bishops. The second restriction is based upon the first restriction but extrapolated to the piece set used by CRC. The third restriction is taken from FRC to preserve castling ability. The fourth restriction helps to minimize the advantage held by White in having the first move. The fifth restriction is to avoid possible legal issues in America with Gothic chess, which was formerly protected by a US patent. The sixth restriction was introduced later upon discovery by Scharnagl that such positions might increase the advantage of first move for White.

Together, these six rules restrict the opening setup to 12,118 starting positions[citation needed].

Extended FEN encoding

Within Capablanca random chess, X-FEN is used (to represent positions).

References

  1. ^ "Contest to design a 10-chess variant". The Chess Variant Pages. 2005-12-25. Retrieved 2007-08-19.