[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 }) *