[Event "LEDGER Puzzle of the week: lichess4545 #11 R2a"] [Site "https://lichess.org/study/Ym7iDmsk/LNJsClhW"] [Result "*"] [Variant "Standard"] [ECO "?"] [Opening "?"] [Annotator "https://lichess.org/@/Kraaft"] [FEN "2r5/pp2knQ1/3qprB1/3p4/1P6/P3R3/5PPP/R5K1 b - - 2 30"] [SetUp "1"] [UTCDate "2018.02.25"] [UTCTime "10:46:27"] [Source "https://lichess.org/study/Ym7iDmsk/LNJsClhW"] [Orientation "black"] [ChapterMode "gamebook"] { Black to move. Shared by @archone team4545 #11 ; Round 2 ; Board 2 @arsenalfanrichi vs @archone gamelink: https://lichess.org/9rB3H671 } 30... Qf4 { The reason this move is so effective is that the queen is attacking f2 directly and c1 through the white rook (thus pinning it), as well as creating one other threat should white find the only way to prevent mate. } { [%csl Gc1,Gf2][%cal Gf4f2,Gf6f2,Gf4c1] } 31. Ree1 { In the game, White played Rf1 here leading to a mat in 4. Bonus points for you if you find it. Answer in the next and last good move of this position. Click the hint button if you are startled by this good defence by White. } (31. Rf1 { The game move leading to mat. } 31... Qxf2+ { If Kh1, then Qxf1#. } 32. Rxf2 Rc1+ { The rooks now converge on f1 and mate is inevitable. } { [%csl Gf1][%cal Gf6f1,Gc1f1] } 33. Re1 { White tosses a rook in the way to delay mate. } 33... Rxe1+ 34. Rf1 Rexf1# { Either rook capture is mate. }) (31. Rf3 { The rook cannot move along the 3rd rank, because of the weak back rank and the pressure on c1. } { [%cal Gf4c1,Gc8c1] } 31... Qc1+ 32. Rxc1 Rxc1#) (31. Re2 { White cannot move his rook along the e-file either (with the exception of Ree1), because of the same issues (pressure on c1 and a weak back rank). } 31... Rc1+ 32. Re1 Qxf2+ 33. Kh1 Qxe1#) 31... Qg4 { Excelent, top choice move ! Now the White bishop is lost, you're winning. -4.46/33 sf9 (Answer of the previews mat in 4: Rf1 Qxf2! Rxf2 Rc1 and now after 2 sacrifice of White's rooks it's mat.) } { [%csl Gg6,Ge6][%cal Gg4g7,Gg4e6] } (31... Qg5 { It's the second best move. You have the right idea and you're still winning. But what about Rxe6+ now ! I'm sure you can easily find the more precise move now. cpl > 150 -2.54/33 sf9 }) (31... Rh8 { Third best move. You have the wrong idea but you're still winning. White here is gonna take your Knight, and Qxh2+ is unfortunately not that strong. cpl > 400 -1.40/33 sf9 }) (31... Rf8 { I don't know how you find this move, but it's the forth best one. And you're not winning anymore. This Knight doesn't need protection, but some of White pieces might ! Let's try again. cpl > 350 -0.62/32 sf9 }) (31... Qxf2+ { No. You needed to switch gear here because it's no trouble for White after Kh1. There is something else in this position that you have lost. cpl > 350 -0.55/32 sf9 }) *