From: Pieter Stouten EMBL BITNET> Date: 25 nov 1990 Subject: Fully annotated 4-th game of the Ryu O title match. Sorry for the delay, but here it is. The fourth game of the Ryu O match. Pieter Stouten embl bitnet>. Ryu O Title Match 1990, Game 4: Habu Yoshiharu - Tanigawa Koji. Played on 15 and 16 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 3:09. 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. 21.Bx5e Sx5e 22.S'7g P4d 23.Px4d S5ex4d 24.K6h P'7c Why not 24.P7d ? After 24... P'7c the position is balanced. On 20-th November, I met Mr. Habu and asked him: "Why didn't you play 24.P7d ?". He replied: "I wanted to play 25.P7d after 24.K6h and didn't think that Mr. Tanigawa would play P'7c so soon". 25.G7h-6g K2b 26.K7h G5a 27.P2e S3e 28.G5f R4b 29.P'4e P'4d 30.Px4d S3ex4d 31.B'6e B'6a 31... S4e?? 32.P'4c. 31... R8b? 32.P'4e S3e 33.G4g favours black. 32.S6g S4e 33.Gx4e Rx4e 34.B3h R4b 35.P9e P3e 36.P'4g P1d 37.P1f B3d 38.P5f P5d 39.B2g P'4f 40.Px4f Rx4f 41.P3f 41.P'4g? R2f strongly favours white. 41... Bx2e 42.Px3e B3f! (now white stands slightly better) 43.P3d S4d 44.P3c+ Sx3c 45.Bx3f Rx3f 46.P'3g R4f 47.P'4g R4b 48.B'5c R4a 49.B3e+ (49.B7a+? G5b) P'3h 50.Rx3h B'2g 51.R2h B4i+ 52.N1g +B3i 53.R2f P'3d 54.+B5c G'3e 55.R2g +B3h 56.P'2h P'4f 57.Px4f Rx4f White stands clearly better now. 58.P'4g +Bx4g 59.+Bx6c G5a-4b (time 7:07 - 7:21) 60.+Bx8a +B3h?!/!? Tanigawa wants to play 62.P'5g. 60... +B3h induces black to play 62.+Bx5d, after which white can play 62... P'5g. 61.P'4g +Bx4g 62.+Bx5d 62.+Bx9a would meet 62... +B3h again, but now black does not have a pawn in hand ! 62... P'5g 63.Gx4g Rx4g+ 64.B'7f +R4h 65.S'6h G'5c (7:19 - 7:40) 66.+B8a P'4f 67.P3f P4g+ 68.P'4i +R3h 69.Rx4g? Black should have fought for a draw and played the following line: 69.Px3e P5h+ 70.N2e +Px6h 71.Sx6h S'5g 72.Nx3c+ Nx3c 73.S'7i 69... +Rx4g 70.Px3e +Rx4i 71.+B2g +Rx1i 72.N'4e R'3i 73.P'4i L'2d 74.Px3d Sx3d 75.Nx5c+ Lx2g+ (7:37 - 7:46) 76.+Nx4b Gx4b 77.Px2g Rx4i+ 78.L'5i B'3g? After 78... +R2h white would have a won position. 79.P'3e S4c 80.G'6i N'8d? 81.B6e P'6d? 82.B8c+ P'4g 83.G'3f Bx5i+ 84.Gx5i +Rx5i 85.Sx5i +Rx5i (7:46 - 7:56) 86.G'6i +R4h 87.R'6h L'8a 88.+Bx8d! Lx8d (the position is equal now) 89.B'5e P'3c 90.Rx4h Px4h+ 91.N'3d Sx3d 92.Px3d B'5d (7:51 - 7:59) 93.Px3c+ Nx3c 94.S'3a Kx3a 95.R'5a P'4a 96.Rx5d+ +P5h 97.B'2b!! 97.P'3d?? +Px6i 98.B'2b K2a or 97.P'4c? G3b 98.Bx3c+ Gx3c 99.N2e R'4h and in both cases white will win. 97... Kx2b (7:58 - 7:59) 98.P'3d R'4h 98... +Px6i?? 99.Px3c+ Gx3c 100.Bx3c+ Kx3c 101.N2e K3b 102.+R5b G'4b 103.G'3c K2a 104.N'1c Lx1c 105.Nx1c= K1a 106.L'1b Kx1b 107.+Rx4b Px4b 108.G'2b Kx1c 109.G2bx2c mate. 99.Px3c+ Gx3c 100.Bx3c+ Kx3c 101.N2e K3b 102.Sx5h! 1-0 (7:59 - 7:59) 102... Px5h+ 103.P'3c K2a 104.G'3b K1b 105.+Rx1d mate. What a tough game ! Murooka Katsuhiko