A chess problem, in which both Kings are mated, having usually two help-mate solutions. In one solution Black plays first and helps White to mate the Black King. In another solution White plays first and helps Black to mate the White King.
ECHESSPEDIA
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
The Golden Age, when machines were weak and my hair was strong!
Garry Kasparov 2017
Magnus is playing fantastic and I play like I always play, pretty badly
Anish Giri 2017
Time trouble is blunder time.
Alexander Kotov
I give 98 percent of my mental energy to Chess. Others give only 2 percent!
Robert Fischer