Position 20/Solution

Solution: Explication/explanation: -Fd2: le moyen le plus rapide de piéger la Reine des Noirs. a3 est jouable aussi, mais un peu plus lent: Fd2 ...Dxb2 Tb1 ...Dxb1 Dxb1/ a3 ...Da5 Fd2 (ce coup doit dans tous les cas être joué!) ...b6xc5 Ca4 ...Cb4 etc... -Bd2: the fastest way to trap the black Queen. a3 is playable too, but is somewhat slower: Bd2 ...Qxb2 Rb1 ...Qxb1 Qxb1/ a3 ...Qa5 Bd2 (the move must be played anyway!) ...b6xc5 Na4 ...Nb4 etc...