visayanbraindoctor: <ChessHigherCat: Wednesday or Thursday puzzle: 30. White to move.>
30. Be4! is a brilliant interference move by Rapport. It breaks the pin on the White f4 pawn and is based on the pinned Black rook on e5 (there is a skewer threat Qxg7# if the rook moves).
Moreover, it comes on the tail of a (mistaken) combination by Black beginning with 27... Nxd4 28. Nxd4 Bxd4 29. Qxd4 Rxe5!
It would have made an extraordinary little combination that refutes a longer combination by Cordova. Especially if 30. Be4! were the only move to win.
Unfortunately, 30. Bd3! seems to win even faster, threatening the Black c4 Knight that supports the hanging and pinned Black e5 rook.
Nonetheless, I still maintain that 30. Be4! is a brilliant interference move. It still wins after all.