Simon Harmsma - Erik ten Hagen 1-1

In the final round of the semi-finals of the Dutch Championship 2023 Simon Harmsma battled for his final chance to reach the final.

1.34-29 19-23 2.33-28 23x34 3.39x30 17-21 4.44-39 11-17 5.50-44 7-11 6.38-33 21-26 7.42-38 1-7 8.47-42 20-25 9.39-34 14-19 10.44-39 10-14 11.49-44 5-10 12.28-23 18x29 13.34x23 25x34 14.40x29 19x28 15.32x23 15-20 16.45-40 16-21 17.38-32 11-16 18.32-27 21x32 19.37x28 26x37 20.41x32 13-18 21.43-38 20-25 22.40-34 14-20 23.35-30 7-11 24.30-24 10-15 25.46-41 17-21 26.41-37 11-17 27.37-31 9-13 28.31-27 2-7

diagram 1

29.44-40(?)

It was probably better to immediately attack the black left wing using 29.48-43! 4-9 30.34-30 25x34 31.39x30 18-22 32.27x18 13x22 33.32-27 22x31 34.36x27 21x32 35.38x27. This position is much harder to defend for black than the one in the game.

4-9 30.48-43 18-22 31.27x18 13x22 32.32-27 22x31 33.36x27 21x32 34.38x27 17-21 35.42-38 21x32 36.38x27 12-17 37.40-35 7-11 38.34-30 25x34 39.39x30

diagram 2

17-22(?) 40.27x18 16-21?

Black is too eager to make a king.

41.43-38?

With 41.18-13! 9x18 42.23x12 8x17 43.30-25 white could have forced a very promising endgame with a piece more.

21-26 42.18-12 8x17 43.28-22 17x39 44.38-33 39x19 45.24x4 11-17 46.4-27 20-25?

This is losing. A funny way to make a draw was 17-22! 47.27x25 6-11! 48.30-24 3-9 49.25x3 11-17 50.3x21 26x17 etc.

47.30-24 25-30 48.27-21 30x19 49.21x30 26-31 50.30-48 31-36 51.48-37 3-9 52.35-30 9-13 53.30-25 13-18 54.37-19 6-11 55.19-37 11-17

diagram 3

56.37-19?

White should have won the game by first playing 56.29-24! Then after 17-22 57.37-19 18-23? white can for example take 58.19x17. Now if black immediately tries to make a king using 36-41? he loses due to 59.17-28 W+. Hence black must play 15-20 59.25x14 36-41 and then white decides the game by building a capture position with 60.17-8!, see diagram 3a)

3a) black to move loses

Note that this is not the only possible capture position, an alternative one is given in diagram 3b)

3b) black to move loses

So on move 57 black must wait using 22-27 58.19-46! 27-31 59.46-32! 18-22 60.32-46! 22-27. Now white cannot play 61.46-23? due to 27-32 62.23x26 36-41 with a draw. But instead white builds another capture position using 61.25-20! 31-37 62.46x16 36-41 63.16-32! 41-47 64.32-10 15x4 65.20-15 47x20 66.15x24 W+

18-23 57.19x11 15-20 58.25x14