Black has just played Rc2. What is the threat? How should white parry it?

That position is from croga - yahnozha, round 2.

This is from round 1, lephudien vs. Aromas, white to move and win a pawn.

Game 1 threat Rh1++, so I would play Kg1. But at first glance it looks like black is still winning with an overwhelming number of pawns. E.G. Kg1 Rhd2-d4 after N moves. I suppose Rxh3 Nd4 fork is okay since that's doubled anyway? But seems like a pawn is dangerous.

Game 2 I'm thinking d4 gives white a strong center. Either exd4 Rxd4 and f3 pawn falls, or d4 e4 and 2. Qb4 hits both the e4 and d6 pawns.

Game 3:



This is from round 1 game ducetray-croga.

Black has three mates. What are those? :D

Hi,
For game1: Kg1
game2: Qa3!
game3: Rxg1++, fxg1 = Q++, fxg1 = R++

good stuff, dr. frank

Game 4:



This is from oliverisaac - kliszek. White has just played 16.Nxe5. Why this is a mistake?

This is a correction to JoshuaR's solution to Game 2. He said that Qb4 would hit on both the d6 and e4 pawn's after having made the move d4. That is in error since the white d4 pawn would be blocking the attack on the e4 pawn. Therefore Qb4 after d4 would only hit on the d6 pawn not the e4 pawn.