Philidor Countergambit (PCG) Variation Tree | Position-by-position Computer Analysis

Philidor Defense

1.e4 e5 2.Nf3 d6  

Lopez Countergambit

1. 3.Bc4 f5 

 

1. 1. 4.d3
      1. 4...Be7
      2. 4...c6
         1. 5.a4
         2. 5.exf5 Bxf5
            1. 6.Bg5 Nf6
            2. 6.0-0 Be7
         3. 5.Nc3
         4. 5.0-0
      3. 4...Nc6
         1. 5.Nc3
         2. 5.Ng5 Nh6
         3. 5.0-0
   2. 4.d4
      1. 4...exd4
      2. 4...fxe4 5.Nxe5
      3. 4...Nc6
         1. 5.dxe5
            1. 5...dxe5 6.Qxd8
               1. 6...Kxd8
               2. 6...Nxd8
                  1. 7.exf5 7.exf5 Bxf5
                  2. 7.Nc3
                  3. 7.Nxe5
                  4. 7.0-0 fxe4 8.Nxe5 Nf6
            2. 5...fxe4
         2. 5.Ng5 Nh6 6.d5
            1. 6...f4 7.h4 Nb8 8.Ne6
            2. 6...Ne7
               1. 7.exf5
               2. 7.Nc3
         3. 5.0-0 fxe4 6.Nfd2 d5 7.Bb5
   3. 4.exf5 Bxf5
      1. 5.d3
      2. 5.Nc3
      3. 5.0-0 Be7
   4. 4.Nc3
      1. 4...Be7
      2. 4...Nc6 5.d4 Be7 6.dxe5 dxe5
      3. 4...Nf6
   5. 4.Ng5 Qxg5

Philidor Countergambit

1. 3.d4 f5

 

1. 1. 4.Bc4 (See 4.d4 above in Lopez Countergambit)
   2. 4.Bd3 fxe4 5.Bxe4 d5
      1. 6.Bg5 Be7 7.Nxe5 dxe4 8.Qh5 g6 9.Nxg6 Bg4 10.Qxg4 hxg6
         1. 11.Be3
         2. 11.Qe5
         3. 11.Qxe4
            1. 11...Kd7
            2. 11...Kf7
            3. 11...Kf8
            4. 11...Nc6 12.Qxg6 Kf8 13.Be3 Nxd4 14.Nc3 Nc6
               1. 15.h4
               2. 15.Ne2
               3. 15.Qf5 Nf6 16.Qg6
      2. 6.Nfd2
      3. 6.Nxe5 dxe4 7.Qh5 g6 8.Nxg6 hxg6 9.Qxh8 Kf7
         1. 10.0-0 Bg7 11.Qh7 Bf5 12.Na3 Qxd4 13.Qh4 Nf6 14.Qg3 Na6 15.Qb3
         2. 10.Qh7 Bg7
   3. 4.dxe5 fxe4
      1. 5.Nd4 a6
      2. 5.Nfd2
         1. 5...Bf5
         2. 5...d5
         3. 5...e3 6.fxe3
         4. 5...Nc6
      3. 5.Ng5 d5
         1. 6.c4 Bb4
            1. 7.Bd2 Qxg5 8.Bxb4 d4 9.Qxd4 Nc6
               1. 10.Bd2 Nxd4 11.Bxg5
                  1. 11...h6 12.Be3 Nc2 13.Kd2 Nxa1 14.Be2 Bf5
                  2. 11...Nc2
                     1. 12.Be3
                     2. 12.Kd2 Nxa1 13.Be2
                        1. 13...Bf5 14.Na3 h6 15.Be3 0-0-0 16.Kc3 Ne7 17.Rxa1 Nc6
                        2. 13...h6
                           1. 14.Be3
                           2. 14.Bh5+
               2. 10.Qc5 Qc1 11.Ke2
                  1. 11...Bg4+
                  2. 11...Nh6
               3. 10.Qd2 e3 11.fxe3 Nxb4 12.Qxb4 Ne7
            2. 7.Nc3 d4 8.a3 Bxc3 9.bxc3
               1. 9...e3 10.f4
               2. 9...Nc6
         2. 6.e6
            1. 6...Bb4 7.c3 Bc5 8.Nxe4 Be7
            2. 6...Bc5
               1. 7.Nc3
               2. 7.Nf7 Qf6
                  1. 8.Be3 Bxe6 9.Nxh8 Bxe3 10.fxe3
                     1. 10...Nc6 11.Nc3 0-0-0
                     2. 10...Qxb2 11.Nd2 Qc3 12.Rb1 Qxe3 13.Be2 Nf6 14.Rxb7 Nd7 15.Nb3 0-0-0 16.Rb5 Bg4 17.Qd2 Qxe2 18.Qxe2 Bxe2 19.Kxe2 Rxh8 20.Ra5 Kb7 21.Rb1 Nb6 22.Nd4 Rf8
                  2. 8.Qd2
               3. 7.Nxe4 Bb4 8.c3 dxe4 9.Qxd8 Kxd8 10.cxb4 Bxe6 11.Nc3 Nf6 12.Bg5 Nbd7 13.Nxe4 h6 14.Bxf6 Nxf6 15.Nxf6 gxf6 16.0-0-0 Kc8
            3. 6...Nc6
            4. 6...Nf6 7.Nf7 Qe7 8.Nxh8 Bxe6
               1. 9.Be2 Nc6 10.Bh5 g6
                  1. 11.Be2
                  2. 11.Nxg6 hxg6 12.Bxg6 Kd7 13.h4 Qg7 14.h5 Bc5
                     1. 15.Be3 Bxe3 16.fxe3 Qh6
                     2. 15.Rh4
               2. 9.Nc3 Nc6 10.Bb5
            5. 6...Nh6 7.Nc3 c6
               1. 8.Be3 Nf5 9.Nf7 Nxe3 10.fxe3
               2. 8.g3
                  1. 8...g6
                  2. 8...Qe7 9.Bh3 g6
               3. 8.Ngxe4
                  1. 8...dxe4 9.Qh5 g6 10.Qe5 Rg8 11.Bg5 Bg7 12.e7 Qd7 13.Qf4 Qf5
                  2. 8...Nf5
                     1. 9.Ng3
                        1. 9...Bxe6 10.Bd3
                        2. 9...Nxg3 10.hxg3 Bxe6
                        3. 9...Qf6
                     2. 9.Ng5 Qf6 10.Bd3
         3. 6.f4
            1. 6...Bb4+
            2. 6...Bc5
            3. 6...Be7
         4. 6.g3
            1. 6...Bb4
               1. 7.c3
               2. 7.Nc3
               3. 7.Bd2
            2. 6...Be7
            3. 6...Nc6
         5. 6.Nc3 Bb4
            1. 7.a3 Bxc3 8.bxc3 Ne7
   4. 4.exf5
      1. 4...Bxf5 5.Nc3 e4 6.Ng5 d5 7.f3 e3 8.Bxe3 h6
      2. 4...e4
         1. 1. 5.Ne5
               1. 5...Bxf5
               2. 5...dxe5 6.Qh5
            2. 5.Nfd2
            3. 5.Ng1 Bxf5
               1. 6.c4
               2. 6.d5
               3. 6.Nc3 d5
               4. 6.Ne2
            4. 5.Ng5
               1. 5...Bxf5 6.Nc3 d5 7.f3 e3 8.Bxe3
               2. 5...Nf6
            5. 5.Qe2
   5. 4.Nc3 fxe4 5.Nxe4
      1. 5...d5
         1. 6.Nc3 e4 7.Ne5
         2. 6.Ned2
         3. 6.Neg5
            1. 6...e4 7.Ne5 Nh6 8.Nxe4 dxe4 9.Bxh6 Qf6
            2. 6...exd4
            3. 6...h6
               1. 7.Bb5
               2. 7.Nf7
         4. 6.Ng3
            1. 6...e4 7.Ne5 Nf6
               1. 8.Be2
               2. 8.Bg5 Bd6 9.Nh5 0-0 10.Qd2 Qe8 11.g4 Nxg4 12.Nxg4 Qxh5 13.Ne5 Nc6 14.Be2 Qh3 15.Nxc6 bxc6 16.Be3 Rb8 17.0-0-0 Rxf2 18.Bxf2 Qa3 19.c3 Qxa2 20.b4 Qa1 21.Kc2 Qa4 22.Kb2 Bxb4 23.cxb4 Rxb4 24.Qxb4 Qxb4 25.Kc2 e3 26.Bxe3 Bf5 27.Rd3 Qc4 28.Kd2 Qa2 29.Kd1 Qb1
               3. 8.f3
            2. 6...exd4
         5. 6.Nxe5 dxe4
      2. 5...Nf6
         1. 6.Bb5
         2. 6.Bg5 Be7
         3. 6.Nxf6 gxf6 
         
         Visit http://oeco.hopto.org/mediawiki/index.php/Philidor_Countergambit for an up-to-date variation tree.