<div class="user_solution"><div>a)</div><div>1. Sf2? Kg3 2. Sg4 Kh4 3. Kf4 Kh5 4. Bh7 Kh4 5. Kf5 Kh5 6. Sf3 (7. Bg6#)<br />5. ... Kg3!<br />5. Sf3+ Kh3? 6. Sf2#<br />5. ... Kh5 6. Kf5 (7. Bg6#)<br />1. ... Kxg1 2. Sg4 stalemate!<b><br /></b></div><div><b><br /></b></div><div><b>1. Kg5!</b> Kg3 2. Bf5 Kh2 3. Sf2? Kg3 4. Se4+ Kh2 5. Sf3#<br />3. ... Kxg1 4. Sg4 Kf1!<br />3. Sf3+ Kg3 4. Shg1 Kf2 5. Kf4 Kf1 6. Bd3+ Kf2 7. Sh3#</div><div><br /></div><div>b)</div><div>1. Kg5? illegal move!</div><div><br /></div><div><b>1. Sf2!</b> Kh5 2. Be2+? Kh4 3. Bg4 Kg3 4. Se4+ Kh4,Kh2 5. Sf3#<br />2. ... Kh6!<br />1. ... Kh5,Kg3 2. Sg4 Kh4 3. Kf4 Kh5 4. Bh7 Kh4 5. Sf3+ Kh5 6. Kf5 (7. Bg6#)</div><div><br /></div><div>Keywords: miniature, twin, no white pawns, switchback (Kk,BSk), changed continuations, square vacation, line opening, line closing, selfblock, stalemate avoidance<br /></div><br /></div><br />