Проблемски шах — разлика између измена

[http://www.matplus.net/dps/Bilten_37.pdf 37 ] [http://www.matplus.net/dps/Bilten_38.pdf 38 ] [http://www.matplus.net/dps/Bilten_39.pdf 39 ] [http://www.matplus.net/dps/Bilten_40bilten_40.pdf 40 ] [http://www.matplus.net/dps/Bilten_41.pdf 41] [http://www.matplus.net/dps/Bilten_42.pdf 42] [http://www.matplus.net/dps/Bilten_43.pdf 43]