Originally posted by bobbob1056thThere are two similar conditions to your idea.
If white has two kings he can afford to lose one of them
1) Rex Multiplex. Pawns may promote to King. Checkmate is obtained by checking ALL kings such that none of them can get out of check next move. Check w/o mate is only allowed if ALL checked Kings can get out of check next move.
2) Giveaway chess. Captures are mandatory, Kings are not royal, pawns may promote to King, and the first one to give away all his pieces wins.
Your idea might yield some interesting compositions (at least, interesting to a fan of chess variants....)
Originally posted by bobbob1056thWhat computer was it? Does it recognize basic stalemates such as wKa6, Pa7; bKa8 with black to move?
I'd be happy to demonstrate it:
[fen]4k3/1pppp3/8/QB1BB3/Q1B1R3/Q1NN1R2/1PPPPK2/8 w - - 0 1[/fen]
1. b4 Kd8 2. Nb1 Kc8 3. Qa2 Kb8 4. Na3 Kc8 5. Q4b3 Kd8 6. Qaa4 Kc8 7. Qbb1
Kb8 8. Q4b3 Kc8 9. Ke3 Kb8 10. Ba1 Kc8 11. Kd4 Kb8 12. Kc3 Kc8 13. Kb2 Kb8
14. Ba4 Ka7 15. b5 Kb6 16. Nc1 Ka5 17. Bd3 b6 18. Rb4 c6 19. c4 c5 20. Bc2
e5 21. Rc3 d6 22. Bde4 ...[text shortened]... 't regaurd this as stalemate, as well as other positions where all the pieces are on the board.