The following chess FEN position...
q1r1k1rQ/7p/Pppp4/1pn1p1NP/1BbpP2P/3PP1p1/3K2PR/1b1n1B2 w - - 0 50
is illegal. Black has all 8 Pawns, yet Black also has both Bishops being on the same color square. This is impossible in chess. Only a Pawn promotion can give you 2 Bishops on the same color square.
Is there any chess playing software that will NOT allow the setup of this type of position, where one side or the other has all 8 Pawns but also has both Bishops on the same color square? Does Chessbase allow one to setup this kind of position? I don't have Chessbase so I don't know. I do have SCID and it allows this position.
NOTE: this position came up in a game of Hostage Chess, invented by Dr. John Leslie of Victoria, B.C.
In Hostage Chess, this type of position is legal because a Bishop could be captured, and then later brought back onto the board but on the same color square as the other Bishop for that side, even if all 8 Pawns are still on the board for that side.
EDIT: I have verified that SCID will report an error if you try and give either side an extra minor piece or Queen when that side has all 8 Pawns still on the board.
So the problem seems to be limited to the two-Bishops-on-the-same-color-square situation.
q1r1k1rQ/7p/Pppp4/1pn1p1NP/1BbpP2P/3PP1p1/3K2PR/1b1n1B2 w - - 0 50
is illegal. Black has all 8 Pawns, yet Black also has both Bishops being on the same color square. This is impossible in chess. Only a Pawn promotion can give you 2 Bishops on the same color square.
Is there any chess playing software that will NOT allow the setup of this type of position, where one side or the other has all 8 Pawns but also has both Bishops on the same color square? Does Chessbase allow one to setup this kind of position? I don't have Chessbase so I don't know. I do have SCID and it allows this position.
NOTE: this position came up in a game of Hostage Chess, invented by Dr. John Leslie of Victoria, B.C.
In Hostage Chess, this type of position is legal because a Bishop could be captured, and then later brought back onto the board but on the same color square as the other Bishop for that side, even if all 8 Pawns are still on the board for that side.
EDIT: I have verified that SCID will report an error if you try and give either side an extra minor piece or Queen when that side has all 8 Pawns still on the board.
So the problem seems to be limited to the two-Bishops-on-the-same-color-square situation.
Comment