[Event "Groningen"] [Site "?"] [Round "0"] [White "Guimard"] [Black "Euwe"] [Result "0-1"] [FEN "r4r2/2p2p1k/1p1p2pp/1PnPp1q1/p1P1P1P1/P3NPR1/3Q3P/4R2K b - - 0 1"] {The Knight has several support-points The Black Knight on c5 already stands very well, but if need be it can move via b3 to d4, where under certain circumstances it may be even more active. By contrast, the White Knight has no prospect of improving its position. It could go to b4 to c6, but there it would be virtually out of play, since the pawn position would not allow the other White pieces to cooperate with it.} 1... Rh8 { with the intention of opening a file for the Rooks} 2. Qe2 Kg7 3. Ng2 (3. Nf5+ Kf8 {loses time as the knight must retreat}) 3... h5 4. h4 hxg4 {An important intermediate move, which prevents White from closing the position by Pg5} 5. fxg4 {Gives Black the opportunity for a decisive combination} (5. Rxg4) 5... Rxh4+ $1 6. Nxh4 Rh8 (6... Qxh4+ 7. Qh2) 7. Kg2 (7. Rh3 Rxh4 8. Rxh4 (8. Qh2 Rxg4 9. Rh7+ Kf8 10. Rf1 Rf4) 8... Qxh4+ 9. Kg2 Nd3 $1) 7... Qxh4 8. g5 Nb3 9. Rg1 Nd2 {The point of the final combination. The square f1 is guarded.} 10. Kf2 (10. Qxd2 Qh2+ 11. Kf3 Qxd2) 10... Nxe4+ 0-1