1.c4f5Opponent opens with the English. I responded with the Dutch defense. I chose this opening because I normally would choose it or 1.d6 but I didn't want to trade my center pawn for the c pawn since it would be a bad trade flank for center.2.d3Nf6My opponent continues with a move I don't really understand. It seems to deviate from the typical English plans such as 2.nc3 or 2.g3 which are what I normally would continue with if I were playing the English. I chose 2.nf6 because it continues development and follows the opening plan for the Dutch defense.2...e53.e4?!...Inaccuracy. Nf3 was best.My opponent pushes his e pawn to the center which I am willing trade a flank pawn for.3.Nf3d64.d4g65.g3Bg76.Bg2O-O7.O-ONe43....fxe4I take the central pawn.4.dxe4e5Here I made a mistake. I should have taken the free pawn with 4.nxe4 however I didn't spend enough time looking at the options and missed it. I saw it immediately after my move. I should definitely slow down before making moves, and think.5.Bd3Be7?!=Inaccuracy. Bc5 was best.My opponent protects his pawns with this move. I continue with my development and support my night on f4. Computer says I should have moved the bishop to c5.5...Bc5⩱6.Nf3d67.Nc3O-O8.h3Nc69.O-ONd410.Nxd46.Nf3...This seems a reasonable continuation for white, he develops his knight and prepares to castle kingside.6....Nc6I continue with development. Perhaps better is O-O. The computer says 6.nc3 was best so I guess I made the right move here.7.O-OO-O8.b4??...Blunder. Nc3 was best.It appeared to me that white hung this pawn. After using the computer analysis this appears to be the critical moment in the game where white lost.8.Nc38....Nxb4?→Mistake. Bxb4 was best.I took the pawn and attacked the bishop at d3. Better was 8...Bxb48...Bxb4-+9.Nxe5(9.Nfd2a510.a3Bc511.Nb3Ba712.Nc3d613.Bg5h614.Be3Be615.Rb1)9.Nxe5...White recaptures a pawn and defends his bishop at c3. I think black is better in this position due to the rook on f1 aiming down the half open file.9....d6A dual purpose move. It attacks the knight and opens my light squared bishops ability to develop.9...Bd610.Bb2Qe811.Nf3Nxd312.Qxd3Nxe413.Qd5+Qe614.Qd4Qg615.Qd5+Kh816.Nc3Nf617.Qd1b618.Nb5Bc519.Ne5Qe420.Re1Qh421.Bd410.Qb3??...Blunder. Nf3 was best.I think white blundered here. Black can now play 10. dxe510.Nf3Nd710....dxe5!Black captures a free knight and still defense his knight on b4. Also this move attacks the bishop on d3 .11.c5+...I felt worried when white played this move, but after looking a moment I realized that after 11...kh1 12.Qxb4 Qxd3 black seems fine.11....Kh812.Bg5?...This move doesn't really help white I think better would have been 12.rd1 defending the bishop on c3.12.Qxb4Qxd313.Nc3Ng414.Rd1a515.Qb3Qa616.Nd512....Bxc5∓I get a pawn and defend my knight. I felt like this was the best move, and I feel at this point that black is probably better.12...Nxd313.Qa3?...I'm not sure what white was thinking with this move. maybe better was 13. a3 attacking the knight?13....Qxd3I offered to trade Queens. I was up material and I felt this would put me in a better attacking position once 14. Qxd3 nxd313...Nxd314.Qxd3Nxd315.Nc3Bxf2+Better was 15...nxf2 16.15...Nxf216.Rxf2Ng417.h3Rxf218.Kh1(18.hxg4Rxa2+19.Kh2Rxa1)Rc219.hxg4Rxc320.Rb1c616.Kh1Bd417.Nb5Bxa118.Rxa1Nxe419.Nxc7Ndf2+19...Nxg520.Kg1Nh3+21.gxh3Nxg522.Nxa8Nxh3+23.Kg2Nf4+24.Kg3Ne2+25.Kh4?!...Checkmate is now unavoidable. Kg2 was best.25.Kg2Bd726.Re1Nf4+27.Kg3Nh5+28.Kg2Bc6+29.Kh3Rxa830.Rxe5Nf631.Kg3Kg825....Rf4+26.Kg5h6+26...Rg4+27.Kh5Nf4#27.Kg6Rg4+?Lost forced checkmate sequence. Be6 was best.27...Be628.Kh5(28.h4Bf7#)Bf7#28.Kh5?...Checkmate is now unavoidable. Kf7 was best.28.Kf7Rc429.a4Nf430.Ke7Rc631.Nc7Rxc7+32.Kd6Rc233.Kxe5Ng6+34.Kd6Kh735.a5Nh436.Kd5Nf537.Ke4Kg638.Ra4Kf639.Kd3Rxh240.Rc4Ne741.Rc1Ra242.Rc5Bf5+43.Ke3Be644.Kd3Nf545.Kc3Ra446.Rb5Ra3+47.Kb2Nd648.Rc5Rxa549.Rxa5(49.Rc7b650.Rc1Rb5+51.Kc3Rc5+52.Kb2Rxc153.Kxc1Nc454.Kc2h555.Kd1a556.Ke2a457.Kd1a358.Kc1a259.Kd1a1=Q+60.Ke2Qb2+61.Kf3Bd5+62.Kg3Qg2+63.Kh4Qh2#)Nc4+28....Kh728...Nf4#29.Re1g6#0-1 Black wins by checkmate.0-1