RUY LOPEZ - The Steinitz Defence Deferred

Board Position
The second most popular continuation of the old but strong Ruy Lopez or Spanish Opening (qv.), the opening where White's starting advantage is said to be held for longer than in any other game.
Sometimes called just "The Deferred Steinitz", it is reached by Black's playing of a defensive but utilitarian 4..P-Q3(d6) (move 4B, left) after the Morphy 3..P-QR3(a6), 4.B-R4(Ba4) bridge - the Steinitz Defence move deferred (ie. delayed). This defence is a major alternative to the Close Morphy (qv.), the Open Morphy (qv.), the Archangel and other 6th move variants.
The main line (below) leads to the topical Siesta Var. while an immediate B-for-Kt exchange usually leads to the Alapin Var. An alternative "Attack" line (below) has an instructive Noah's Ark Trap example.

Begin or Clear or Groups or see move: 1 e4 e5 2 Nf3 Nc6 3 Bb5 a6 4 Ba4 to 4..d6 for:

Siesta Variation: 5 c3 f5 6 exf5 Bxf5 7 d4 e4 8 Ng5 d5 9 f3 e3 10 f4 Bd6 11 Qh5+ g6 12 Qfe Qfe
"Exchange" Var: 5 Bxc6+ bxc 6 d4 f6 7 c4 g6 8 Nc3 Bg7 9 Qa4 Ne7 10 dxe fxe 11 c5 0-0
"Attack" Variation: 5 d4 b5 6 Bb3 Nxd4 7 Nxd4 exd4 8 Bd5 Rb1 9 Bc6+ Bd7