SOLUTION
White is dominating the d file. Black needs to find some counterplay.
Pushing the a6 pawn to a5 will weaken white's c5 pawn. Timing is very important here. If black delays the a5 push then white will move the a4 pawn to a5 and black will permanently lose the opportunity to play a5.
WHITO TO PLAY
SOLUTION
White is a piece down but is about to win it back. e8 square is being guarded by black queen and rook. White's best move is Qxc8 removing one of the defending pieces. Then the white pawn queens and white is an exchange up.
BLACK TO PLAY
SOLUTION
Black's d3 night is attacking white's f4 bishop which is protected by the e2 night, Black can capitalize on the fact that white's e2 knight is unprotected at the moment. Black can play Rhe8 attacking the e2 knight. If white moves the knight, the f4 bishop will fall. If white plays Ra2 protecting the knight, then Rxe2 followed by Nxf4 will win two minor pieces for rook.
WHITE TO PLAY
White is already ahead in material and can capture black's b5 pawn also. But the excellently placed white knight, rook, and queen present an excellent opportunity.
Be5 traps the black queen, and black has to lose one piece by playing ..Bd6. ...Bc8 also loses one piece after Bxc7 ..Bxa6, Nxe7
BLACK TO PLAY
Black's major pieces infiltrated white's king side. There is an opportunity to win material.
..Rxe2 Kxe2 and then ..Qg2+. White's queen is unprotected. Protecting the queen with Kd1 loses the white knight on f1. So black gets at least two minor pieces for the rook.
BLACK TO PLAY
White knight is immobile. White king's pawn structure is weakened. Black plays ..Be4 threatening ..Rg2+ Kh1 and then a discoverted check winning material.
WHITE TO PLAY
White rook, white bishops, black's dark-squared bishop, and black queen are lined up in d file without any pawns separating them. White has an excellent opportunity to pin the d6 bishop.
White plays Be5 (wasting no time). Black rook on f8 is ineffective as it cannot directly defend the d6 bishop. Black has to either give up the queen or lose the dark-squared bishop to the pin.
BLACK TO PLAY
Black is behind in material and is defending a difficult position. But a hasty move by the opponent may give a chance to reduce the material deficit.
White just moved king to d3 square. Black should immediately play Nd7. Advancing the white pawn to b7 is of no use because of the fork Nc5+ winning the b7 pawn.
BLACK TO PLAY
White makes the natural attacking move 1. Rg7-g6 attacking the f6 pawn and threatening Rh6+ followed by Rxh5. But black can parry these threats with a simple move and in fact gain decisive advantage.
With 1...Ng4 black restricts the white rook's movement totally. 2.Rg7 does not work now because 2...Rb5 leaves both white pieces attacked.
Even if white moves 2. Kd2, still 2...Rb5 threatens 3...Kh7. Leaving the white king on d3 is no good because of 2...Ne5+
WHITE TO PLAY
Black is attacking queen side. White needs to give up some material to open up black king's fortress. White's best move is 1. f5, exf5 2. Bxf5. Capturing the bishop allows 3. Qh5 attacking the f7 and h7 pawns.