| Quest of the lost systems |
|
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| Chapter Four: Aigakari |
| Section 2: Tsukata Special |
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 5. Yonenaga(b) vs Tanigawa(w), up to S-7b.
Tanigawa moved his right S to 7b. A standardized move in the aigakari
opening now. S-6b is almost obsolete these days. Most people make S-7b,
without even thinking about it, it seems. S-7b does make sense against the
hineri-bisha, 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
move, 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+,
Sx8h, and P*6f, handing Black a devastated position.
