# Tag Info

### Is this selfmate solvable or fixable?

First the verdict on the posted problem. It has certainly no solution in up to 12 moves (checked by Popeye v4.79). And the author of the Gustav software which specializes in selfmates says that there ...
• 9,458
Accepted

### Description of rectangular opposition in Silman's Complete Endgame Course

the rule is to make a square or rectangle in which each color is the same color with the other guy to move. I'm not quite sure how this sentence makes sense other than there is a typo, and it ...
• 1,306

### Is this selfmate solvable or fixable?

Is there a solution? I don't think so. If the White queen goes to a square where it can interpose, then Black can just play BxB. If, for example, White tries Qe8-d7 or Qe8-e6, hoping Black will move ...
• 15.5k

### Description of rectangular opposition in Silman's Complete Endgame Course

There is a crucial part missing from the definition. To have the opposition you must have an odd number of squares between the kings when it is your opponent's turn to move. This is obvious when you ...
• 77.4k