Botvinnik Semi-Slav, The (Pedersen)

JO ... iJ.e7 111
a) 150-00-0-016 a4 l:.xd4 17 'iie2
b4 18 lbe4 'it'e5 19 l:.adl l:.hd8 20
l:.xd4 'iWxd4 21 lbg5 l:.d7 + Tunik­
Dreev, USSR 1985.
b) 15 a4 and now:
bl) 15 ... b4 16 lbe4 'it'e7 17 'it'e2
O-O-O!? (17 ... f5 18 lbc5 lbxc5 19 dxc5
'iWxc5 20 'iWxe6+ 'fie7 21 'fixe7+ rt;xe7
22 0-0 ± Ross-Schiller, Pan American
1986) 18 'ir'xc4 e5 19 dxe5 'iWxe5 20
0-0 l:ld4 21 'it'c2 c5 22 l:.fel 'it>b8 23
h4 'ir'd5 24 i.f3 'fif5 25 l:.e3 l:lhd8 is
unclear, Ribli-Fahnenschmidt, Bundesliga
1985/6.
b2) 15 ... 0-0-0 16 axb5 cxb5 (Polugaevsky
also considered 16 ... l:.xd4,
when 17 'iWf3 'it'xf3 18 i.xf3 cxb5 19
i.xb7+ ~xb7 20 lbxb5 %:te4+ 21 'it>f1
%:td8 is equal, but White might try 17
bxa6!? l:.xdl+ 18lbxdl i.a8 190-0
followed by lbe3; this is of course
risky but perhaps promising as it is not
so easy for Black to wake up the sleeping
bishop on a8) 17 i.xb7+ ~xb7 18
lbxb5 with a further divide:
b21) 18 ... 'fif5?! 19 'fia4! 'fie4+ 20
rt;d2 'ir'c6 21 b3 leads to a distinct
advantage for White, Polugaevsky­
Flear, London 1986.
b22) 18 ... lbb4 190-0 lbc6 20 'fie2
± Babula-Vavra, Czech Extraleague
1998/9.
b23) 18 ... e5 19 d5 and then:
b231) 19 ... lbc5 has the point that
a4 is not accessible to White's queen
but then another route to near Black's
king is available: 20 l:.xa7+ ~b6 21
'ir'd2! lbd3+ 22 ~f1 (22 ~dl? 'it'f3+
23 ~c2 'it'xf2 was rather embarrassing
for White in Kirilov-Nei, Tallinn tt
1986; White inevitably loses a piece
and there is no perpetual afterwards,
so White took the fastest course to end
the game and resigned) 22 ... 'it'xf2+ 23
'iWxf2+ lbxf2 24 ~xf2 'it>xb5 25 %:txf7
and White is better even though it is
not clear that it is enough to win the
game.
b232) 19 ... lbb4 20 l:.xa7+ (20 O-O??
'fih6! and White resigned in view of
21 h4 'fi xh4! in Eingorn-I vanovic, Bor
1986) 20 ... 'it>b6 21 'fia4lbd3+ 22 'it>d2
'fixf2+ 23 ~c3 'fixb2+ 24 ~xc4 l:lc8+
25 'it>xd3 e4+ 26 ~e3 l:.c3+ 27 lbxc3
'fixc3+ 28 'it>xe4 f5+ 29 'it>f4 'it'd2+
Ih-1f2 Ehlvest-Ivanchuk, Minsk 1986. I
can imagine there is a perpetual.
c) 15lbxb5 with a further branch:
cl) 15 ... cxb5!? (playing 15 lbxb5
one does not really expect this to work
but it is not so clear) 16 i.xb7 lbb4 17
0-0 (17 i.xa8lbd3+ 18 ~d2 'it'xd4 is
probably just a draw) 17 ... %:td818 'it'd2
lbd3 19 i.c6+ ~e7 20 i.xb5 %:tdg8,
intending ... 'fih4, is actually very dangerous
for White and led to quick win