From: Takako Noda <mxc06231 <at> JA2 <dot> SO-NET <dot> OR <dot> JP>
Date: 24 feb 1997
Subject: "QUEST" Tsukata Special (6)

Tsukata Special (6)

Tanigawa played Yonenaga on June 29, 1987, which decided the challenger for
the Oh-i-sen.

   9    8    7    6    5    4    3    2    1
+--------------------------------------------+       Tanigawa in hand:
| wL | wN |    | wG | wK |    | wS | wN | wL |  a   +------------------+
+--------------------------------------------+      |                  |
|    | wR | wS |    |    |    | wG | wB |    |  b   |                  |
+--------------------------------------------+      +------------------+
| wP |    | wP | wP | wP | wP | wP | wP | wP |  c
+--------------------------------------------
|    |    |    |    |    |    |    |    |    |  d
+--------------------------------------------+
|    | wP |    |    |    |    |    |    |    |  e
+--------------------------------------------+
|    |    |    |    |    |    |    | bR |    |  f
+--------------------------------------------+
| bP | bP | bP | bP | bP | bP | bP |    | bP |  g
+--------------------------------------------+      Yonenaga in hand:
|    | bB | bG |    |    |    |    |    |    |  h   +------------------+
+--------------------------------------------+      |                  |
| bL | bN | bS |    | bK | bG | bS | bN | bL |  i   |                  |
+--------------------------------------------+      +------------------+
Diagram 6. Yonenaga(b) vs Tanigawa(w), up to S-7b.

Tanigawa moved his right S to 7b. A standardized move in the aigakari openin
g now. S-6b is almost obsolete these days. Most people make S-7b, without ev
en thinking about it, it seems.  S-7b does make sense against the hineri-bis
ha, but the idea began as a countermeasure against the Tsukata Special.

Moves from the diagram: (from black)
P-1f, P-1d;      S-3h, P-6d;       P-7f, P-8f;       Px8f, Rx8f;
P*2d, Px2d;      Rx2d, R-8b;       Rx6d,

Compared with the Tsukata-Yoshida game (described in the previous posting),
the only difference so far is the S-7b, where Yoshida made S-6b. The next mo
ve, however, reveals what Tanigawa had up his sleeve: P-3d. The move aims at
 a) after exchanging Bs, to drop B at 8f, a K-R fork, and b) to drop P at 2g
. P-3d has to precede P-drop on 2g. Otherwise, black would shift his R to 2d
, which would nullify White's intention.

What if Black responds with Rx3d to P-3d? White would then make:  Bx8h+, Sx8
h, and P*6f, handing Black a devastated position.

Yonenaga was forced into long deliberation, trying to come up with an idea t
o cope with all these threats. After 75 minutes, he made...

K-4h, P*2g;       G-3i, P*6h;

Black's camp received a deadly blow with brilliant P-drops: After dropping a
 Pawn on 2g which would be hard for the opponent to take, Tanigawa dropped a
nother P at 6h, which Yonenaga simply could not get rid of.

Moves afterwards: (from black)
P*8g, P-6i+;       Bx2b+, Sx2b;       S-8h, P-2h+;        Gx2h, B*5e;
R-6e, +P-6h;       Rx5e, +Px7h;

In exchange for B, Tanigawa took G, with S practically in hand (2-mai-gae),
thereby establishing dominance over Yonenaga at this point.
>From then on: (from Black)
Rx5c+, G*5b;      +R-5f, +Px8h;       B*9f, S*6c;

As was shown above, Tanigawa lavishly used pieces just captured to solidify
his own camp, claiming the victory.

The S-7b was said to be the fatal blow, and no one dared to take up the Tsuk
ata Special thereafter. That is, no one but Tsukata himself. Tsukata alone w
as undaunted, revising and developing the strategy to prove his
P*2d is viable.
(TO BE CONTINUED)