The board is 8x10 because the new pieces are stronger versions of orthodox pieces: Speed Master (fFcefFmfW[cel]fK[cl]sWimnAimnD), National Master (NmK[cl]K), Candidate Master (K[cl]K), FIDE Master(BmW[cl]K), International Master (RmF[cl]K), Grandmaster (Q[cl]K). The SM can use its checker moves to capture en passant and the FM, IM and GM can double displace on the next two squares in front of themselves and this is the only way masters may do multiple captures where the pieces are in different squares. Alternatively, they may use approach capture as in Fanorona, or even both modalities. En passant is also treated like an ordinary capture.
The Pawns and SMs start in the same squares so both can have an initial double step. In order to be fair, any orthodox piece may share a square with the Master which has the same orthodox moves. Line pieces may also pass through the first square in their lines occupied by the player’s other piece. But if two pieces are in the same square, they must be captured separately.
To balance the defensiveness of castling, any orthodox piece and the Master which has the same orthodox moves may move on the same turn.
Promotion is still earned at the 8th rank, but Pawns and SMs do not have to promote until the 10th and it does not cancel their right to reset the 50/75 move count by simply moving. Until all SMs have promoted or been taken, only they may promote to NM, FM, IM or GM.
A game is won by physically taking the King, but a quarter point may be claimed for baring the orthodox pieces and is given by force for perpetual check
“Emanuel and Edward Lasker“ Gothic Checker Chess
The board is 8x10 because the new pieces are stronger versions of orthodox pieces: Speed Master (fFcefFmfW[cel]fK[cl]sWimnAimnD), National Master (NmK[cl]K), Candidate Master (K[cl]K), FIDE Master (BmW[cl]K), International Master (RmF[cl]K), Grandmaster (Q[cl]K). The SM can use its checker moves to capture en passant and the FM, IM and GM can double displace on the next two squares in front of themselves and this is the only way masters may do multiple captures where the pieces are in different squares. Alternatively, they may use approach capture as in Fanorona, or even both modalities. En passant is also treated like an ordinary capture.
The Pawns and SMs start in the same squares so both can have an initial double step. In order to be fair, any orthodox piece may share a square with the Master which has the same orthodox moves. Line pieces may also pass through the first square in their lines occupied by the player’s other piece. But if two pieces are in the same square, they must be captured separately.
To balance the defensiveness of castling, any orthodox piece and the Master which has the same orthodox moves may move on the same turn.
Promotion is still earned at the 8th rank, but Pawns and SMs do not have to promote until the 10th and it does not cancel their right to reset the 50/75 move count by simply moving. Until all SMs have promoted or been taken, only they may promote to NM, FM, IM or GM.
A game is won by physically taking the King, but a quarter point may be claimed for baring the orthodox pieces and is given by force for perpetual check