1 e4 e5 2 Bc4 Nf6 3 Nc3 Ne4 4 Bf7 Kf7 5 Qh5 Kg8 6 Ne4 d5 7 Ng5 Qf6 8 d3 g6 9 Qf3 Qf3 10 Ng1f3 Bg7 11 Bd2 h6 12 Nh3 g5 13 Nhg1 e4Although trapping pieces is something I do quite often, I have rarely seen (or done) anything as elegant as this; and after some uninteresting moves, the game ended with a W Rook being trapped as well.
Naturally, I thought about designing a chess variant to commemmorate this game. What would Trap Chess be? Hmmm...
Check is pictorial, so in our example if 2...d7-d5 3 Ne4-d6+, it is check even though the K could not be captured (it can run away, so it's safe from capture; but it's check anyway because "it looks like check").
Finally, let's make sure we understand "trapped": if a piece has any legal move that can bring it to a square that is not attacked, it is not trapped. If the piece has no escape that is both safe and legal, it is trapped.
For example 1 e3 e5 2 Nf3 Be7 3 Ng5 Bf6 4 Bc4 h6 5 Qf3 (capturing on f7 would be stronger) e4 5 h3, and now 5...h6:g5 is legal because the escape Ng5:e4 is safe but not legal and the escape Ng5:f7 is legal but not safe -- the Ke8 attacks f7 even though it can't really capture there.
Obviously, a pinned piece is trapped; and a Pawn attacked vertically by a R or Q is trapped. Does this give W a blowout fast win?
Warning: I've had a lot of trouble doing this analysis. It's easy to make a mistake about whether a move is legal or not.
1 e4 e5?? 2 Qh5 does win at once. There is no defense against the combination of the threat of Qh5:f7 mate (legal because a pinned piece such as the Pf7 is always trapped), plus the threat of Qh5:h7:h8 (both this and the previous can be defended by ...g7-g6, but then the next threat gets stronger), plus the final threat of Qh1:e5+ and Qe5:e7 checkmate.
1 e4 d5? 2 Qg4 threatens both Qg4-d7 mate and Qg4:g7 which wins the R and more.
1 e4 e6 2 Qg4 Qg5 is a simple and safe defense? Remember that 3 Qg4:e6+ is illegal.
1 e4 e6 2 d4? Bb4+ wins for Black.
1 e4 e6 2 Qh5! g6 3 Qe5 (or Q:g6) Bg7 4 Qe6+ wins; or 1 e4 e6 2 Qh5! Qf6? 3 Qf7; or 2...Nf6 3 Qe5 (perhaps 3 Qd5 is even stronger!); or 2...Qg5 3 Qf7 (the Q is uncapturable because she has an escape square at f3).
Perhaps 1 e4 g6 is playable (hmmm, but what if 2 Bf1-b5), but I already don't like the way the game is shaping up, and so I'll add one more rule:
With this final rule, I believe the game is likely to be playable, but I still can't be sure.
Therefore, one expects the game to be explosive, featuring sudden tactical finishes in apparently calm positions.