From: Manabu Terao - Nihon Sun RM Advisory Staff
Date: 22 feb 1997
Subject: Re: Forced mate or brinkmate(hisshi)

Dear Shogi-fans,

First of all, small correction in my previous post.

Yashiki had 1 munites left plus 30 second byouyomi which
is three times longer than I wrote.

Though using almost all 1 munite and 30 second to find a sequence
of possible forced mate, Yashiki finally chose to drop his Gold
in 5e. It was a complete brinkmate(hisshi). Sato could not help
resigning then.

In my study, there was a forced mate as the bottom. It's really
a tough mate problem. (There might be a better(=shorter) sequence.
please try if you are interested.)

Regards
Manabu Terao

> The diagram is where Black moved his King from 8g to 7g
> against the White's check of B*6i.
>
>    9    8    7    6    5    4    3    2    1
> +--------------------------------------------+       White in hand:
> |+bP |    | wK | wG |    |    | wS |+bB | wL |  a   +------------------+
> +--------------------------------------------+      | 2 Golds          |
> |    |    | wS |    |    |    |    |    |    |  b   | 1 kNight, 1Pawn  |
> +--------------------------------------------+      +------------------+
> |    | wP |    |    |    |    |    | wP | wP |  c
> +--------------------------------------------
> | wP |    | wP | wP |    |    | wP |    |    |  d
> +--------------------------------------------+
> |    | bG |    |    |    |    |    | bP |    |  e
> +--------------------------------------------+
> |    | bP | bP | wN |    |    |    |    |    |  f
> +--------------------------------------------+
> | bL |    | bK | bS |    |    | bP |    | bP |  g
> +--------------------------------------------+      Black in hand:
> |    | bS |    | bP |    |    |    |    |    |  h   +------------------+
> +--------------------------------------------+      | 1 Rook, 1 kNight |
> |    |+wR |    | wB |    |    |    | bN | bL |  i   | 1 Lance, 3 Pawns |
> +--------------------------------------------+      +------------------+


Forced mate sequence I find:

      +Rx8h
 Kx6f  G*6e
+Bx6e  Px6e
 K5f   N*4d
 K5e   P*5d
 Kx4d  B*3e
 Kx5d  S6c
 Kx6c  G6b
 K6d   G5c
 K7d   S*7c
 Kx7c  B4f
 Kx8c  G*8b
 Kx9d  +Rx9g
 P*9e  L*9c
 K8d   B7c
 K7e   G6d