Dutch Championship 2017 Urk round 10

Waldo Aliar - Martijn van IJzendoorn 0-2

1.32-28 17-21 2.33-29 20-25 3.39-33 11-17 4.44-39 6-11 5.50-44 1-6 6.31-26 19-23 7.28x19 14x23 8.37-32 10-14 9.41-37 15-20 10.46-41 14-19 11.35-30 5-10 12.40-35 10-15 13.44-40 21-27 14.32x21 16x27

diagram 8
diagram 1

15.38-32?

The white position is already unpleasant, and after this move it quickly gets worse. Van IJzendoorn will lock up the white right wing, leaving white with a lot of difficulties.

27x38 16.43x32 9-14 17.48-43 3-9 18.42-38 20-24 19.29x20 15x24 20.49-44 24-29 21.33x24 23-28 22.32x23 18x20 23.39-33 20-24 24.47-42 13-18 25.36-31 11-16 26.41-36 7-11 27.38-32 8-13 28.43-38 2-8 29.31-27

diagram 2
diagram 2

17-22? 30.33-29?

Here Aliar could solve his problems with 30.32-28! 22x31 31.36x27. A few variants to illustrate this are:

24x33 31.38x29 22x31 32.36x27 11-17 33.44-39 17-22 34.37-31 22-28 35.32x23 19x28 36.29-24

diagram 3
diagram 3

28-33

At first sight the white position looks completely lost, but surprisingly it is a draw. This is mainly due to the combination 6-11(?) 37.24-19! 14x23 38.39-33 28x39 39.34x43 25x34 40.40x29 23x34 41.43-39 34x43 42.42-38 43x21 43.26x6 and the endgame is a draw.

37.39x28 12-17 38.24-20! 13-19(?)

Here 18-22 39.27x18 13x33 40.30-24 leads to a draw. And after 14-19? white can even win using 39.28-23 19x28 40.20-14 9x20 41.30-24 20x29 42.34x3 W+

39.42-38?

Aliar misses the combination 39.28-22 17x28 40.34-29 25x23 41.42-38 14x25 42.38-33 28x39 43.40-34 39x30 44.35x2 with a draw.

9-13 40.20x9 18-22 41.9x18 22x42 42.18-12 8-13 43.12x21 42-47 44.21-17 13-18

Jitse Slump - Wouter Sipma 2-0

1.33-29 18-23 2.29x18 13x22 3.34-29 12-18 4.38-33 7-12 5.40-34 9-13 6.42-38 1-7 7.47-42 19-23 8.32-28 23x32 9.37x28 14-19 10.45-40 19-24 11.41-37 16-21 12.31-26 11-16 13.37-31 7-11 14.34-30 3-9 15.30x19 13x24 16.40-34 9-13 17.34-30 4-9 18.30x19 13x24 19.39-34 9-13 20.44-39

diagram 7
diagram 4

13-19? 21.28-23! 19x28 22.34-30

Now black is left with a very unfavorable attack, due to the many pieces on his right wing.

21-27 23.30x19 10-14 24.19x10 5x14 25.35-30 2-7 26.29-24 20x29 27.33x24 17-21 28.26x17 12x21 29.50-45 21-26 30.45-40 26x37 31.42x31 16-21 32.30-25 8-13?

After this move the position becomes critical for black. With 7-12! 33.31-26 11-16 34.26x17 12x21 35.39-34 8-13 he could have equalized the position.

33.40-35 7-12 34.31-26 11-17 35.39-34? 6-11 36.43-39 11-16 37.34-30 13-19 38.24x13 18x9 39.38-33 12-18 40.46-41 18-23 41.41-37 27-32??

A huge mistake. Of course Sipma never intended his right wing to be locked after 9-13 42.37-31, but after 15-20 43.39-34 28x39 44.34x43 23-28 he has enough positional compensation for a draw.

42.33-29 23x43 43.49x18 28-33 44.48-43 21-27 45.30-24 16-21 46.18-12 17x8 47.26x17 9-13 48.17-11 8-12 49.11-6 12-18 50.6-1 33-39 51.1x10 39x48 52.10-4

Marino Barkel - Anton van Berkel 1-1

1.32-28 17-22 2.28x17 11x22 3.37-32 6-11 4.31-26 12-17 5.36-31 8-12 6.32-27 16-21 7.27x16 22-28 8.33x22 18x36 9.41-37 19-23 10.39-33 14-19 11.44-39 10-14 12.38-32 20-24 13.42-38 5-10 14.46-41 15-20 15.50-44 10-15 16.48-42 13-18

diagram 2
diagram 5

17.34-29!

Barkel comes up with an original plan that is very successful in this game.

23x34 18.40x29 9-13 19.32-28 3-9 20.37-32! 20-25 21.29x20 15x24 22.44-40 18-23 23.41-37 4-10 24.40-34 10-15 25.49-44! 14-20 26.44-40 13-18

diagram 3
diagram 6

27.28-22!

Van Berkel hasn't succeeded in keeping the massive white center under control.

18x27 28.32x21 9-14 29.34-30 25x34 30.40x18 12x23 31.21x12 7x18 32.16x7 1x12

diagram 4
diagram 7

33.26-21?

The black position has a bad structure due to the missing piece on 13. The best way to take advantage of that was 33.37-32! 12-17 34.42-37. Then black can only narrowly escape using 18-22! 35.37-31 36x27 36.32x12 22-27! 37.26-21 27x16 38.33-28 23x32 39.38x27 19-23, but this doesn't look safe at all.

18-22 34.33-29 24x44 35.43-39(?)

A much better chance to win was 35.21-17! 22x11 36.43-39 44x33 37.38x16. But then 2-7 38.37-32 19-23 39.32-27 23-28 40.45-40 28-33 41.27-21 14-19 42.21-17 19-24! 43.40-34 20-25! 44.17-11 15-20 45.11x2 24-29 46.34x23 20-24 47.2x30 25x34 is still sufficient for a draw.

44x33 36.38x27 19-24 37.27-22 24-30 38.35x24 20x29 39.22-17 29-33 40.17x8 2x13 41.45-40 14-19 42.40-34 19-23 43.21-17 23-29 44.34x23 33-39 45.17-11 39-44 46.11-7 44-49 47.7-1 49-21 48.1-7 15-20 49.7-16 21-12 50.16-27 12x40 51.27x25 40-23

Hein Meijer - Nico Knoops 2-0

1.33-29 17-22 2.39-33 11-17 3.44-39 6-11 4.50-44 20-25 5.35-30 19-23 6.32-28 23x32 7.37x28 22-27 8.31x22 18x27 9.41-37 17-21 10.37-32 21-26 11.32x21 26x17 12.46-41 16-21 13.41-37 11-16 14.38-32 13-18 15.43-38 18-22 16.28-23 14-20 17.30-24 7-11 18.32-28 21-26

diagram 8
diagram 8

19.37-32? 1-6?

Knoops could have ended the game immediately using the combination 17-21! 20.28x6 26-31 21.36x27 25-30 22.34x14 10x37 23.42x31 21x23.

20.42-37 17-21 21.28x17 11x22 22.47-42 6-11 23.33-28 22x33 24.39x28 11-17 25.44-39 9-13 26.49-43 13-18 27.40-35 4-9 28.34-30 25x34 29.29x40 20x29 30.23x34 9-13 31.39-33 13-19 32.34-30 8-13 33.43-39 2-8 34.40-34 19-24 35.30x19 13x24 36.45-40 8-13 37.34-30 13-19 38.30-25 10-14 39.40-34 18-23 40.36-31 3-9 41.34-30 9-13 42.39-34 12-18 43.31-27 5-10 44.34-29 23x34 45.30x39

diagram 9
diagram 9

17-22?

The situation looked quite bad for black, but after 18-23 46.48-43 15-20 47.39-34 13-18! (and not 10-15? 48.34-30 W+) 48.43-39 17-22 49.28x17 21x12 50.33-28 23-29! 51.34x23 18x29 52.28-22 10-15 he would be OK.

46.28x17 21x12 47.33-28!

Now white has complete control over the left wing.

15-20 48.37-31 26x37 49.42x31 24-29(?) 50.31-26 18-23 51.28-22 12-17 52.22x11 16x7 53.27-22?

This move is inaccurate, and could have cost Meijer the victory.

20-24?

Of course Knoops wants to develop his pieces by making the backward exchange 13-18 22x13 19x8. But white can simply avoid that. Therefore he should have prepared this move by 7-11! The main idea behind this is that 54.26-21? fails due to the small combination 29-34 55.39x30 23-28 56.22x33 11-17 57.21x12 13-18 58.12x23 19x39 with a draw.

54.22-17 7-12 55.17x8 13x2 56.26-21 10-15 57.21-17 2-7 58.32-27 14-20 59.25x14 19x10 60.38-32 10-14 61.27-21 15-20 62.21-16 14-19 63.17-11 7-12 64.11-6 20-25 65.16-11 29-34 66.39x30 25x34 67.32-28 23x32 68.6-1 12-17 69.1x40 17x6 70.48-42 6-11 71.40-49 24-30

© Wieger Wesselink http://10x10.org