[Event "Vienna"] [Site "?"] [Round "0"] [White "Kmoch"] [Black "Alekhine"] [Result "0-1"] [ECO "A46"] [Opening "Indian: 2.Nf3"] 1. d4 Nf6 2. Nf3 d5 3. c4 c6 4. e3 Bf5 5. Nbd2 {5.Qb3 would try to take advantage of Black's light squared bishop leaving the b-pawn undefended.} 5... e6 6. Be2 Nbd7 7. O-O Bd6 8. c5 Bc7 9. b4 Ne4 10. Nxe4 dxe4 {10...Bxe4 11 .Nd2 f5 12.Nxe4 fxe4 when White's two bishops and queenside initiative would give him the advantage .} 11. Nd2 h5 {With White having the better of it on the queenside it is only natural that Black should start a kingside attack.} 12. f4 {White was afraid of the Black bishop on c7 aiming at his king so he locks him out. However, a new target has appeared the White pawn on f4.} 12... g5 13. g3 {This slow defending move allows Black a winning initiative. 13.Nc4 Nf6 14.Ne5 gxf4 15.exf4 Although Black would still retain the better chances due to the weakness of White's pawn on d4.} 13... Nf6 {Black idea is to play 14...h4 without White being able to block the kingside with pawn g4. 13...h4 14.g4 when White has blocked Black's play on the g-file.} 14. Bb2 { 14.fxg5 Ng4 when Black regains his pawn with a kingside initiative.} 14... gxf4 15. exf4 h4 16. Qb3 {16.g4, trying to keep the kingside closed would be met with 16...Rg8 17.h3 Nd5 would win White's f-pawn.} 16... hxg3 17. hxg3 Nd5 18. Nc4 Nxf4 {With this sacrifice Black is able to attack the exposed position of White's king. Notice that White's pieces are misplaced, and cannot help defend their monarch.} 19. Rae1 { 19.gxf4 Qh4 would leave White defenseless against the attack down the h- file.} 19... Qg5 20. d5 Nd3 {White resigned. Can you see why?} 0-1