Botvinnik Semi-Slav, The (Pedersen)

BLACK'S 13TH MOVE ALTERNATNES 73
.te2 l:t.d8) 23 ... tDxc6 24 i.xc6 .ud8
and Black has plenty of counterplay.
19 ... o;Ii>e8 20 .ugl c3?!
This leads to a difficult ending, so
Black needs to try something else:
a) 20 ... .uxh2!? 21 'it'f4! 'ii'xb7 22
0-0-0 gives White excellent compensation
according to Ionov. The strong
passed pawn on d6 hampers Black's
movements, while White is ready to
undermine the king's shelter with g4-
gS-g6.
b) 20 ... .ueS+ 21 .te2 'it'xb7 22
0-0-0 .ud8 23 f4 (23 .ugel I?) 23 ... .udS
24 'it'c3 tDf8 2S .uxdS 'it'xdS 26 .udl
'it'c6 27 i.f3 'it'b6 28 h4 .uxd6 29 .uxd6
'it'xd6 and the endgame should be OK
for Black.
21 bxc3 .ueS+ 22 i.e2 .uxe2+ 23
'it'xe2 ii'xc3+ 24 o;Ii>f1 ii'xal + 2S o;Ii>g2
'it'eS
An attempt to improve on 2S ... 'it'd4?!
26 .udl 'it'a4, Ionov-v.Popov, St Petersburg
1995, when 27 'ii'hS! 'it'e4+
28 'it>gl 'it'xb7 29 'ii'h8+ tDf8 30 d7+
o;Ii>e7 (30 ... 'it'xd7 31 .uxd7 o;Ii>xd7 32
'it'hS +-) 31 d8'it'+ .uxd8 32 .uxd8
'it>xd8 33 'it'xf8+ o;Ii>c7 34 'it'xf7+ ~b6
3S 'it'xb7+ 'ii>xb7 36 h4 c4 37 o;Ii>f1 is
winning according to Ionov.
26 ii'xeS tDxeS 27.ubl
27 tDxcs .uc8 28 tDe4 fS gives Black
no worries.
27 ... b4 28 tDxcs as 29 .uel tDd7 30
tDa4 ±
Tella-San Segundo, Athens 1997.
0222)
160-0-0 (D)
B
16 ... ~f8!
Another splendid idea ofYusupov's
in the 13 ... i.h6line. Black steps out of
any knight checks that might pop up in
the event of a future tDe4 or tDxbS,
while also removing the king from
the potentially dangerous e-file. Other
moves have proved less good for
Black:
a) 16 ... 0-0-0?! 17 tDe4 'it'eS 18
'it'xh6 'it'xe4 19 dxe6! 'it'xhl 20 i.h3
+- Quist-Thesing, Dieren 1988.
b) 16 ... exdS?! 17 i.g2 tDb6 18
.txdS tDxdS 19 tDxdS i.xdS (19 ... 0-0-0
20 tDxf6 .uxd2 21 o;Ii>xd2 i.xhl 22
.uxhl .uxf6 23 f4 ±) 20 'it'xdS 'it'c6 21
.uhel + 'ii>f8 22 h4 .uc8 23 hS! ±
Alterman - Har-Zvi, Israel 1993.
c) 16 ... i.xdS 17 tDxdS exdS and
now:
cl) 18 'it'xdS .ud8 (18 ... tDb6 19
.uel + 'ii>f8 20 'it'xcS+ 'ii>g8 21 'it'xbS!,
intending 'it'eS, is better for White -
Shirov) 19 f4100ks good for White at
fIrst sight but 19 ... tDb6 20 J:tel+ (endings
such as the one arising after 20
'ii'xd8+ 'it'xd8 21 .uxd8+ o;Ii>xd8 are