White to play for advantage (hard)
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Show moves
1.Nf3! exd3 ( 1...exf3? 2.Bd2 ) 2.Qxd3! { 2.Nxe5?= was played in actual game } 2...Bf5 3.Nxe5 Bxd3 4.Bd4! dxe5 ( 4...Kh7 5.Nxd3 ; 4...Be4+ 5.Nf3+! ) 5.Bxe5+ Kh7 6.Rg7+ Kh8 7.Rxc7+ Kg8 8.Rg7+ Kh8 9.Rxa7+ Kg8 10.Rg7+ Kh8 11.Rg3+ Kh7 12.Rxd3± ½-½
Games PGN
Created about 3 years ago. 
[Event "World Championship Match"]
[Site "Moscow"]
[Date "????.??.??"]
[Round "?"]
[White "Petrosian, T."]
[Black "Spassky, B."]
[Result "1/2-1/2"]
[EventDate "1996.??.??"]
[FEN "r4r1k/p1pb4/1p1p3p/3Pq3/2P1pp2/3BB3/PPQN1P1P/6RK w - - 0 1"]
[SetUp "1"]

1.Nf3 $1 exd3 ( 1...exf3 $2 2.Bd2 ) 2.Qxd3 $1 {2.Nxe5?= was played in actual game}
2...Bf5 3.Nxe5 Bxd3 4.Bd4 $1 dxe5 ( 4...Kh7 5.Nxd3 ) ( 4...Be4+ 5.Nf3+ $1 )
5.Bxe5+ Kh7 6.Rg7+ Kh8 7.Rxc7+ Kg8 8.Rg7+ Kh8 9.Rxa7+ Kg8 10.Rg7+ Kh8
11.Rg3+ Kh7 12.Rxd3 $16 1/2-1/2