The solution to last Monday’s problem is that Black can win with 1…Rg3! This threatens 2…Rxh3+!
The main line runs 2. fxg3 Ng4+ 3. Kh1 Qxg3 4. hxg4 Qxh4 mate.
In this week’s problem, Black has to avoid a mine. He should defend his back rank with 1… Rd8.
Can you see what happens if he takes the pawn with 1…Rxd5?