From: Pieter Stouten <STOUTEN <at> EMBL <dot> BITNET>
Date: 16 nov 1990
Subject: Ryu O title game 4, first part. 15 Nov 1990. Annotated.

Ryu O Title Match 1990, Game 4: Habu Yoshiharu - Tanigawa Koji.
First part, played on 15 November 1990. Comment by Katsuhiko Murooka.
 
   1.P7f P8d 2.P2f P8e 3.B7g P3d 4.S8h G3b 5.G7h Bx7g+ 6.Sx7g S4b
   7.S3h S7b 8.P4f S3c 9.S4g K4b 10.G5h S8c 11.P6f S8d 12.P9f (black
   must not allow 12... S9e) P7d
In professional play 12... P9d 13.P3f P7d occurred many times. Instead
of 13... P7d has also been played: 13... P9e 14.Px9e Sx9e 15.Lx9e Lx9e
16.P'9g P'9h 17.S8h L'9a 18.N3g P8f 19.Px8f Rx8f 20.N7g (slightly
better for black), Yonenaga - Minami 1-0, 1990 or 13... K3a 14.N3g G5b
15.K4h P6d!?/?!, Tanigawa - Nakahara 0-1, Meijin title game 6, 1990.
   13.S5f P7e 14.P4e
14.S6e or 14.S6g are solid and give black the better position, but Habu
wanted more.
   14... Px7f 15.Sx7f K3a 16.P'7e S7c 17.B'4f B'6d
The only move: 17... S6d?? 18.P6e S7c 19.P7d or 17... P6d 18.P7d Sx7d
19.Bx6d.
   18.S5e Bx5e 19.Bx5e S6d 20.B4f
20.Bx3c+?! Nx3c allows white to seize the initiative.
   20... S'5e adjourned.
Time used: black 4:27, white 3:01. I think Habu made a wise decision to
seal here and not to play the obvious move 21.Bx5e. In the second
session Tanigawa must take the bishop anyway, so Habu has some extra
thinking time until the next morning. This decision cost him 36
minutes, however, since he had to wait so long before he could seal.
My opinion of the adjourned position is that black stands a bit better.