Center Pin Trick (In Grunfeld) ???

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Nc3 Nxe4 {The start of it} 5.Nxe4 d5 {There's the fork}

1.d4 Nf6 2.c4 g6 3.Nc3 d5 {I haven't played the Grunfeld much lately. In fact, my most recent Grunfelds with black start 1.c4 Nf6 2.Nc3 d5. This is a nice alternative to the Symmetrical English or all those e5 systems where white races the b pawn down the board.} 4.Nf3 Bg7 5.Qb3 {The Russian System} dxc4 {almost forced and best ... White gets the center, and black gets counterplay against it. Real hypermodern stuff...} 6.Qxc4 0-0 7. e4 Bg4 {If I remember correctly Bg4 is a Smyslov system. He has several. I think a quick Nfd7 and Nb6 are also part of this (Bg4) system, but I have forgotten theory. } 8.Ne5 {This is usually a good move in early Bg4 systems against d4. I think 8.Be3 is theory.} Be6 {White must make a decision about his center.} 9.d5 {White gains time but gives up control of c5 and e5.} Bc8 10.Be2 {I may have transposed this and the next move, but I think this is how it went.} e6 {Usually, black combats the d5 pawn with c6, but e6 looks good here. Black can get in exd5, so the locked in bishop won't be a problem for long.} 11.Nf3 {Maybe he was fearing a discovery on the e5 knight. I wondered about this and a counter shot at f7 during the game. 11.Bg5 looked good to me.} exd5 12.exd5 {And this is where the shot 12 ... Nxd5 comes in, instead of my 12. ... Nbd7.}