Botvinnik Semi-Slav, The (Pedersen)

16 .. .'Wia6 AND 16 ... fid6 43
w
(27 'ii'd7 also looks very promising)
27 ... 'ir'hl+ 28 ~d2, and now:
a) 28 ... ii'd5+ 29 'iitc2 .txc5 30 ndl
and White wins. A sample variation is
30 ... b3+ 31 'Witet .td4 32 ii'c7+ 'iita6
33 l:xd4! 'ii'xd4 34 ii'c6+ 'iita5 35 a4!
a6 36 l:xh8 +-.
b) Black can also try 28 ... ltJf3+:
bl) 29 ~e2?! ltJd4+ 30 'iite3 ii'f3+
31 'iitxd4 ii'xf2+ 32 ~xc4 ii'c2+ 33
~d5 l:h5+ 34 l:e5 and then:
bll) 34 ... ii'g2+ 35ltJe4 nxe5+ 36
~xe5 'ii'xb2+ 37 ~f5 +-.
b12) 34 .. Jbe5+ 35 ~xe5 .txc5 and
now 36 ii'c7+~b5 37 a4+! should win;
e.g., 37 ... bxa3 38 ii'b7+ 'iita5 39 ~d5.
b13) 34 ... ii'd2+ 35 ~c6! (35 ltJd3
nxe5+ 36 'it>xe5 ii'e3+ is just a draw;
e.g., 37 'iitd5 {37 'iitf5 ii'xd3+ 38 'iitg4
ii'g6+ 39 'it>h3 'ii'h5+ 40 'iitg2 'ii'e2+
with perpetual check} 37 ... 'ii'xd3+ 38
'it>c6 ii'b5+ 39 'iitc7 ii'b6+ 40 ~d7
ii'e6+ 41 'it>c7 ii'd6+ 42 'Witb7 ii'a6+ 43
~c7 ii'd6+, etc.) 35 ... ii'd6+ 36 'iitb7
lbe5 37ltJb3+ ~a4 38 net and I suspect
White should win.
b2) 29 'it>e3! .th6+ 30 ~e4 (Burgess)
wins outright. It is appealing that
White again allows a double check (as
on move 22), which turns out to be
harmless. The most attractive line is
30 ... nxe8+ 31 ii'xe8 ii'xal 32 ii'a4+
'iitb6 33 ~d5!, when the white king
participates in the final mating attack.
26 ... 'iWhl+
White is threatening 27 nd6+, and
26 ... ii'f5 27 ii'd5! leads to the same
kind of endgame, while Black has no
hope of surviving after 26 ... ltJe6 27
nd6+ .txd6 28 'ifxd6+ ~a5 29 Ihh8
either.
27 'iitd2 'iWe6 28 ii'e8+ ii'xe8 29
llxe8 ltJe6 30 ~el!
White will win the endgame.