grandmaitre n° 14 : Page 51 - Grille 40

Le Territoire du tigre (Forcing Chain Contradiction)

L1C4 ≠ 1 L1C9 = 1 L3C9 = 9 L9C9 = 7 L7C8 = 4 L78C7 ≠ 4 L5C7 = 4 L2C7 = 1 L1C4 = 1
donc L1C4 = 1