204-Mate in 3 SOLUTION

Solution: 1. Rg1! [2. Rg7#]
 1. ... Sd6 2. Bxd6+
    2. ... Kf7/f6 3. Rf8#
 1. ... Sg5 2. Rxg5 [3. Rg7#]
    2. ... Kf7 3. Rg7#
 1. ... Sg3 2. Rxg3 [3. Rg7#]
    2. ... Kf7 3. Rg7#