[Event "LEDGER Puzzle of the week: lichess4545 #11 R1"] [Site "https://lichess.org/study/Ym7iDmsk/JqPr0MIC"] [Result "*"] [Variant "Standard"] [ECO "?"] [Opening "?"] [Annotator "https://lichess.org/@/Kraaft"] [FEN "r3r1k1/1RR2p2/3n2pp/p2p4/3P4/4P3/2Q2PPP/q1N3K1 w - - 0 1"] [SetUp "1"] [UTCDate "2018.02.19"] [UTCTime "05:29:52"] [Source "https://lichess.org/study/Ym7iDmsk/JqPr0MIC"] [Orientation "white"] [ChapterMode "gamebook"] { White to move. Shared by @tmaus team4545 #11 ; Round 1 ; Board 1 @tmaus vs @lemonworld gamelink: https://lichess.org/oSuXPsNw } 1. Rxf7 { Correct, now Black as to protect against Qxg6+ leading to a mat in 2. } { [%cal Rc2g6] } 1... Re6 { Attack ! } 2. Rg7+ { Perfect. Forcing ...Kf8. (...Kh8 Rh7+ Kg8 Rbg7+ Kf8 Qc7! and Black would have to sac their queen to avoid Rh8#) } 2... Kf8 { Now a bonus round. Try to be more precise than a board 1 star ! } 3. Rh7 { Precisely ! Another mat threat. Black has two move : ...Nxb7 or ...Qxb4. Stockfish is calling the mats on every other response. +9.62/33 sf9 } { [%cal Ga1d4,Bd6b7,Bc2c7,Gc1b3] } (3. Qc5 { Second best move. You're still winning after Black's only response not leading to mat: ...Tc8. >200cpl +6.84/33 sf9 } { [%cal Ga8c8] }) (3. Qc7 { Third best move. You're still winning after Black's only response not leading to mat: ...Qxd4. >200cpl +6.77/33 sf9 } { [%cal Ga1d4] }) (3. Rbc7 { Fourth best move and @tmaus choice in the game ! You're still winning. But after ...Qxd4 Black's narrows the gap. >400cpl +5.08/33 sf9 } { [%cal Ga1d4] }) (3. Rxg6 { You're too much materialistic here. But it's still winning ! >800cpl +3.53/33 sf9 }) *