Slaying the Dragon

In honor of the Dragonslayer youth chess tournament tomorrow at Saint George's School, the tactical problems below all come from recent tournament games in the Yugoslav Attack against the Sicilian Dragon.* Sometimes the name St. George Attack is used for certain lines of the Yugoslav attack. I have failed to find historical information concerning this name in the usual places, but it seems appropriate for a line with a reputation for making a dragon's life short and unpleasant. On the other hand, the legend gets a little mixed up when the dragon becomes a mascot. Sometimes the beast prevails against our gallant knight in the positions below.

There may be more than one move that maintains an advantage for the side to move in some positions. We are looking for the best move in each case.

Black to move

Haria -- Wang, High Wycombe Open

3r2k1/p4p1p/3rb1p1/q1p1Q3/2B2P2/1P4P1/P1P4P/2KRR3 b - - 0 26

White to move

Ibrahimova -- Leolko, Moscow Open

2rq1rk1/1p1bppb1/3p2pB/p3n2n/3NP1p1/1BN2P2/PPPQ4/2KR3R w - - 0 16

White to move

Moreno Carretaro -- Perez Manas, Catalan Team Championship

5rkb/pp3p2/3p2pP/4pb1P/4q3/4B3/PPPQ4/2KR3R w - - 0 23

Black to move

Vuckovic -- Fedorovsky, European Individual Championship

r5k1/3R1pn1/1q2pQp1/1N4P1/5P2/2P5/1P6/2K5 b - - 0 40

White to move

Pokhlebin -- Kalinin, Moscow Championship

1r1qr3/4ppk1/2bp2p1/1p6/5Q2/1pN2P2/PPP3P1/2KR3R w - - 0 23

*[T]he name Yugoslav Attack, or Velimirovic variation, would not acquire that name until Dragoljub Velimirovic began playing it in the 1960s. See "12th Soviet Championship: Smyslov."