[Event "New to nuke: Opening queen tactics: Qf3-f5-d7# diagonal"] [Site "https://lichess.org/study/sRM1FScZ/HTbZZMR6"] [Result "*"] [Variant "Atomic"] [ECO "?"] [Opening "?"] [Annotator "https://lichess.org/@/Illion"] [UTCDate "2017.08.23"] [UTCTime "20:20:08"] [Source "https://lichess.org/study/sRM1FScZ/HTbZZMR6"] [Orientation "white"] 1. e3 (1. e4 e6 2. Nf3!? Qf6 3. e5?? { Letting black win using the weakened diagonal. } (3. d4 { 3. d4 is the correct move since now the bishop defends the c1-h6 diagonal. Interesting play follows after 3...Nh6. } { [%cal Gc1f4] }) 3... Qf4 { [%csl Rd2][%cal Bd8f6,Bf6f4,Rf4d2] } 4. d4 Qd2#) 1... e5? { This pawn advance weakens f5 and d5 and the light diagonals h3-c8 and a2-g8, and in this position is already bad for tactical reasons. } 2. Qf3 Nf6?? { 2...Qf6 is best, but still bad for black due to tactics. 2...Nf6 prevents Qd5, but loses to 3. Qf5. } { [%cal Bd1f3,Bf3f5,Bf5d7,Gf6d5] } 3. Qf5 { Slipping in through the diagonal weakened by ...e5. } { [%csl Rd7][%cal Bd1f3,Bf3f5,Rf5d7] } 3... d5 4. Qd7# *