A theme in problems where four black interferences are included by four possible moves of two black pawns. The two pawns, by the very conditions, must stand on their original squares (BCM 55/245).
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Quotes of the Day
When I see the Berlin defence, I am almost happy that I am not longer a top player!
Nigel Short 2016
I think that the World Champion should try to defend the quality of play more than anyone else!
Boris Spassky
As a rule, pawn endings have a forced character, and they can be worked out conclusively.
Mark Dvoretsky
First-class players lose to second-class players because second-class players sometimes play a first-class game
Siegbert Tarrasch
When I am White I win because I am White. When I am Black I win because I am Bogoljubov.
Efim Bogoljubov