PID: 146992 (7b/3p4/2n5/2p1n3/K1k3bR/pRB5/4P3/5Q1B w - - 0 1)
Hall, A
Chess, 1955
#2
7 + 8
SOLUTION
SOUND
Sets
1...Sd3
2.exd3#
1...Sf3
2.e4#
1...Sg6
2.e3#
1...Sf7
2.e3#
1...Sb4
2.Qf4#
1...Sa5
2.Qf4#
1...Sa7
2.Qf4#
1...Se7
2.Qf4#
1...Sb8
2.Qf4#
1...Sd8
2.Qf4#
Tries
1.Bb2?
threat
2.Qc1#
1...Sf3
2.e4#
1...Sd3
2.exd3#
1...Sg6
2.e3#
1...Sf7
2.e3#
1...Sb4
2.Qf4#
1...Sd4
2.Rc3#
1...axb2!
1.Bxe5?
threat
2.Rc3#
2.Qc1#
2.e3#
1...Bxe5
2.e3#
1...Sxe5
2.Qf4#
1...Sb4
2.Rc3#
2.Rxg4#
2.Qf4#
1...Sd4!
1.Rxg4+?
1...Sxg4
2.e3#
2.e4#
1...Sd4!
1.Qg2?
threat
2.Qd5#
1...Sb4
2.Qe4#
1...Se7
2.Qe4#
1...d5
2.Qxd5#
1...Sf3!
1.Qf3?
threat
2.Qd5#
1...Sb4
2.Qe4#
2.Qf4#
1...Se7
2.Qe4#
2.Qf4#
1...d5
2.Qxd5#
1...Sxf3!
1.Qf7+?
1...d5
2.Bxd5#
2.Qxd5#
1...Sxf7!
Keys
1.Ba1!
threat
2.Qc1#
1...Sf3
2.e4#
1...Sd3
2.exd3#
1...Sg6
2.e3#
1...Sf7
2.e3#
1...Sb4
2.Qf4#
1...Sd4
2.Rc3#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 1
REMOVED MATES = 5
Sets
S(e);OGATE::P(C),XS(e)
S(e);N_GUARD::QAB(A)+P(C)
S(f);N_GUARD::QAR(A)
Tries
Try
B(E);
Threat
QAR(A)
Vars
S(e);N_GUARD::QAB(A)+P(C)
S(e);OGATE::P(C),XS(e)
S(f);N_GUARD::QAR(A)
S(f);N_SPINB(c),SBLOCK::R1(D)
Refutation
P(a);XB(E)
Try
B(E);XS(e)
Threat
DUALS(3)
Vars
B(h);XB(E)::QAB(A)+P(C)
S(f);N_GUARD,XB(E)::QAR(A)
Refutation
S(f);N_SPINB(c)
Try
R(G);CHECK,XB(c)
Refutation
S(f);P_SPINS(f)
Try
Q(A);
Threat
QAB1(A)
Vars
S(f);N_GUARD::QAR2(A)
P(g);::QAB1(A),XP(g)
Refutation
S(e);
Try
Q(A);
Threat
QAB1(A)
Vars
P(g);::QAB1(A),XP(g)
Refutation
S(e);XQ(A)
Try
Q(A);CHECK
Refutation
S(e);XQ(A)
Actual
B(E);
Threat
QAR(A)
Vars
S(e);N_GUARD::QAB(A)+P(C)
S(e);OGATE::P(C),XS(e)
S(f);N_GUARD::QAR(A)
S(f);N_SPINB(c),SBLOCK::R1(D)
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).