Pawn and Two: <Phony Benoni> In your diagrammed position, with Black to make his 23rd move, White actually was not at a disadvantage.
Przepiorka played the best response, 23...Re2!, but after 24.Rxe2! Rxe2, Janowski's position was fine.
After 24...Rxe2, Black had some serious looking threats, but his back rank weakness, allows White to maintain the balance: (.35) (26 ply) 25.Qxa6! Qd4+ 26.Kh1 Rxd2 27.Qa8+ Qd8 28.Qxd8+ Rxd8 29.a4 Ra8 30.Ra1, or (.00) (26 ply) 25.Re1 Qxd2 26.Rxe2 Qxe2 27.Qxc6 gxf6 28.Qxf6.
Instead of playing 25.Qxa6!, or 25.Re1, Janowski self-destructed with 25.Be1??.
After 25.Be1??, Black needed to avoid: (1.04) (28 ply) 25...Qh3? 26.Bf2 Qxf3 27.Rf1 gxf6 28.Qxa6 Qg4+ 29.Bg3 h5 30.Rf2, or (2.92) (28 ply) 25...gxf6?? 26.Qxa6 Qd4+ 27.Kh1 Rxb2 28.Rxb2 Qxb2 29.a4, or (3.33) (28 ply) 25...Qe6?? 26.Bf2 h6 27.Qxa6 Rd2 28.Qa8+ Kh7 29.Qa5.
Przepiorka was up to the task, finding the winning move, 25...Qd3!!.
After 25...Qd3!!, Black threatened the Rook on b1, and also the White King, because of White's inadequate defense for the squares e3, f3 and g6.
The White Queen can defend all of these points with 26.Qe4, but then she could be immediately removed from the board with 26...Rxe4.
A sad finish for Janowski, who was having a horrible tournament, with a final score of +3 -11 =2, good enough only for a last place tie, together with his opponent, Przepiorka.