PID: 278863 (6Q1/2br1r2/1p2B3/1N1npnpN/1Rp1k3/K3p3/4P1R1/8 w - - 0 1)
Astahov, V
Mat, 1982
#2
8 + 11
SOLUTION
SOUND
Sets
1...Sc3
2.Rg4#
1...Sxb4
2.Rg4#
1...Sde7
2.Rg4#
1...Sg3
2.Rxc4#
1...Sh4
2.Rxc4#
1...Sh6
2.Rxc4#
1...Sfe7
2.Rxc4#
1...Sg7
2.Rxc4#
Tries
1.Sc3+?
1...Sxc3
2.Rg4#
1...Kd4!
1.Sg3+?
1...Sxg3
2.Rxc4#
1...Kf4!
1.Bxd5+?
1...Rxd5
2.Rg4#
1...Kxd5!
1.Bxf5+?
1...Rxf5
2.Rxc4#
1...Kxf5!
1.Qg6?
threat
2.Rxc4#
1...Sxb4
2.Rg4#
1...Sc3
2.Rg4#
1...Sf4
2.Sg3#
1...Sf6
2.Qxf5#
1...Se7
2.Rg4#
1...Bd6!
Keys
1.Qa8!
threat
2.Rg4#
1...Sg3
2.Rxc4#
1...Sd4
2.Sc3#
1...Sh4
2.Rxc4#
1...Sd6
2.Qxd5#
1...Sh6
2.Rxc4#
1...Se7
2.Rxc4#
1...Sg7
2.Rxc4#
1...g4
2.Rxg4#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 3
REMOVED MATES = 3
Sets
S(d);N_GUARD::R(B)
S(d);N_GUARD,N_SPINP(b),XR(D)::R(B)
S(f);N_GUARD::R(D),XP(b)
Tries
Try
S(E);CHECK
Vars
S(d);XS(E)::R(B)
Refutation
K(c);P-FLIGHT
Try
S(F);CHECK
Vars
S(f);XS(F)::R(D),XP(b)
Refutation
K(c);P-FLIGHT
Try
B(G);CHECK,XS(d)
Vars
R(j);SBLOCK,XB(G)::R(B)
Refutation
K(c);N_SPINP(b),P_SPINR(k),S_FLIGHT,XB(G)
Try
B(G);CHECK,XS(f)
Vars
R(k);SBLOCK,XB(G)::R(D),XP(b)
Refutation
K(c);N_SPINP(b),S_FLIGHT,XB(G)
Try
Q(H);P_PINS(f)
Threat
R(D),XP(b)
Vars
S(d);N_GUARD,N_SPINP(b),XR(D)::R(B)
S(d);N_GUARD::R(B)
S(d);SBLOCK::S(F)
S(d);S_CUTR(k)::QAB1(H),XS(f)
Refutation
B(i);P_PINR(D)
Actual
Q(H);P_PINS(d)
Threat
R(B)
Vars
S(f);N_GUARD::R(D),XP(b)
S(f);N_SPINP(b),SBLOCK::S(E)
S(f);S_CUTR(j)::QAB1(H),XS(d)
P(g);::R(B),XP(g)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).