| notyetagm: Motylev vs Bu Xiangzhi, 2007 <s4life: What a blunder by Motylev!> This is an -unbelievable- blunder from a 2600-rated player, even in blitz. White to play: 42 ?
click for larger viewOf couse White has to regain his piece here with 42 b3xc4  c8xc4, which loses a valuable pawn. So Motylev (White) has the brainstorm that he will regain his piece -and- keep the pawn by using the <PIN> tactic. He plays the -incredible- howler 42 g1-c1??. Position after 42 g1-c1??:
click for larger viewBu Xianzghi (Black) must have fallen out of his chair when he saw this! He simply <BREAKS THE PIN BY DISCOVERY (RUBBERBAND)> with 42 ...  c4-a6!. Position after 42 ... c4-a6! 0-1:
click for larger viewTo meet the threat of c1xc8, the Black c4-bishop moves to a6 where it meets the threat by <DEFENDING> as opposed to meeting the threat from c4 where it <BLOCKS THE CORRIDOR>. White has lost a piece for nothing and resigned. I would swear this was a DGT board error if I didn't know any better. 42 g1-c1?? is perhaps the <BLUNDER OF THE YEAR> at the 2600-level of chess. | 
