Philidor Countergambit: 3...f5 Philidor Defence

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a more aggressive approach black after 3.d4 3...f5!? (see diagram), philidor s original intention , recommendation. in 19th century, 3...f5 played paul morphy. move can lead more open positions other lines, considered dubious. others maintain 3...f5 valid idea. grandmaster tony kosten considers move respectable in monograph on opening. move played david bronstein , teimour radjabov.


after 3...f5 white has several ways proceed:



4.nc3 (the zukertort variation) , white obtains clear advantage:

4...fxe4 5.nxe4 d5 (if 5...nf6 6.nxf6 gxf6 7.dxe5 fxe5 8.bc4 qf6 9.ng5 +/− polugaevsky) 6.nxe5 dxe4 7.qh5+ g6 8.nxg6 nf6 (if 8...hxg6 9.qxh8 be6 10.qe5 +/− larsen) 9.qe5+ kf7 (if 9...be7 10.nxh8 nc6 11.bb5 qd5 12.bg5 +/− zukertort) 10.bc4+ kg7 11.bh6+ kxh6 12.nxh8 bb4+ 13.c3 qxh8 14.cxb4 +/− (keres).
4...exd4 5.qxd4 fxe4 (if 5...nf6 6.e5!) 6.bg5 nf6 7.nxe4 be7 8.bc4 nc6 9.qe3 +/− (sozin).
4...nf6 5.dxe5 nxe4 6.nxe4 fxe4 7.ng5 d5 8.e6 bc5 9.nxe4! +/− (sozin, sokolsky).


4.bc4 leads clear advantage white:

4...exd4 5.ng5 nh6 6.0-0 (6.nxh7, jaenisch variation, leads unclear position after 6...ng4! 7.nxf8 kxf8 8.qxd4 nc6) 6...nc6 7.re1 f4 (or 7...fxe4 8.nxe4 ne5 9.bxh6 gxh6 10.f4 nxc4 11.nxd6+ +/−) 8.bxf4 qf6 9.qd2 ne5 10.be2 bg4 11.f3 bd7 12.bg3 0-0-0 13.f4 +/−.
4...nf6 5.ng5 qe7 (or 5...d5 6.dxe5 dxc4 7.qxd8+ kxd8 8.exf6 +/−) 6.bf7+ kd8 7.bb3 exd4 8.0-0 +/− (berger).
4...fxe4 5.nxe5 d5 6.qh5+ g6 7.nxg6 nf6 8.qe5+ be7 , continuing either 9.qxe7+, 9.nxh8 (steinitz), or 9.bb5+ (keres).


4.dxe5 forces black complicate matters further 4...fxe4 5.ng5 d5 unclear position.

after 6.e6 (the del rio attack), white obtains upper hand after 6...bc5 7.nc3 (the berger variation), or 6...nh6 7.nc3! (berger); however, black can maintain lack of clarity 6...nf6!? 7.nf7 qe7 8.nxh8 bxe6, or 6...bb4+ 7.c3 bc5 8.nf7 qf6 9.be3 bxe6 10.nxh8 bxe3 11.fxe3 qh4+ 12.g3 qh6 13.qd2 nd7 14.c4 ne5 15.be2 dxc4 16.nc3 nd3+ 17.bxd3 exd3 (makarov).
white has 6.nc3!? (steinitz) , 6.c4.


4.exf5 e4 5.ng5 bxf5 6.nc3 , white has slight plus after 6...nf6 7.f3 (sozin), or 6...d5 7.f3.




^ kaufman 2004, p. 22.
^ bauer 2006, pp. 22–32.
^ tony kosten, winning philidor, batsford chess, 1992.
^ hooper & whyld 1996, zukertort variation, p. 460.
^ matanović 1981 (vol c), p. 196, n. 21.
^ matanović 1981 (vol c), p. 197, n. 24.
^ matanović 1997 (vol c), p. 214, n. 6.
^ korn 1982, p. 16, n. (p).
^ matanović 1997 (vol c), p. 214, n. 3.
^ hooper & whyld 1996, jaenisch variation, p. 185.
^ matanović 1981 (vol c), p. 196, n. 14.
^ matanović 1997 (vol c), p. 214, n. 2.
^ hooper & whyld 1996, del rio attack, p. 104.
^ matanović 1981 (vol c), p. 196, n. 10.
^ matanović 1981 (vol c), p. 196, n. 13.
^ matanović 1981 (vol c), p. 196, n. 9.
^ matanović 1981 (vol c), p. 196, n. 8.






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