Ladislav Prokeš

[2] While a strong tournament player, it is his chess compositions that gained him fame.

In 1951 he published a collection of studies "Kniha šachových studií".

His 1,159 endgame studies, as listed in Harold van der Heijden's database, rank fourth among all composers.

[4] The solution begins: and Black threatens to promote a pawn, which would win.

But White forces the draw with: The idea is, that by vacating the c1-square on the fourth move, White's rook prevents Black's pawn from capturing on c1.