This is a position from the Sicilian Najdorf, some kind of hybrid between the f2-f3 variation and Bg5 variation. White has just played Bg5-h4. In this type of position, white wants to attack the black king by pushing the pawn g2-g4-g5. Black answers by pushing the pawn b7-b5-b4. But the white bishop should stand on e3 when white plays with f2-f3. White decides that it should stand on h4, probably planning to retreat it to Bh4-f2 and attack with g2-g4 and h2-h4. Well, it is black to move, can black cook up something good in the thinking pot?