Strong GM giving material for attacking chances

White to play

White has invested material (down a rook) in order to mount an attack. White to play in the position above.

Can White get a return on his investment and if so how ?

Black to play !

What would you do here with Black ?

intricate position

A lot pieces are "en-prise" i.e hanging. No time for positional assesment but only precise moves will do. Are you up to the task ?

Black to play

Hint: You've got to be imaginative and to calculate through the end because your queen,knight AND bishop are under enemy fire...

the path to victory 07-05-2010

Black to play and win !

2 Grandmasters (both with Elo above 2600) were battling in the last round of the U.S World Open played in Philly,PA.

The crucial moment didn't come in the opening or in the ending but in the middlegame.
Black gained a decisive advantage here, taking advatange of 38 Re1-e2?

linear calculation ( puzzle category : easy )

Black to play and win

Hint: Black ( a norvegian promising GM) noticed the awkward situation of the white pieces in the middle of the board and exploited it in a linear and convincing fashion. Yours to find !