Knight Moves

Chessgames.com puzzle of the day for October 20th, 2012 was very interesting. It was from Lewi vs Adamski at the 1969 Rubinstein memorial. It is black's 18th move.

There are a lot of interesting things about this position.

• f3 is potentially weak if the e2-pawn is removed. Black ...f3 safely locks in white's light square bishop.
• h3 is a weak square
• White's queen and rook are in a knight fork geometry
• White's king and the c3-square are in a knight fork geometry
• The key e-pawn is only defended by the Nc3

It is a hard problem, but try to solve it before you look at the game here.