PID: 72280 (8/q5p1/b1R5/6Q1/2nkp3/8/2B2P2/1NK5 w - - 0 1)
Hall, A
Chess, 1953
#2
6 + 6
SOLUTION
SOUND
Sets
1...Qc5
2.Qxc5#
1...Qb8
2.Qc5#
1...Qb7
2.Qc5#
1...Qc7
2.Qc5#
1...Qd7
2.Qc5#
1...Qf7
2.Qc5#
1...Qa8
2.Qc5#
1...Se3
2.fxe3#
1...Sb6
2.Qc5#
Tries
1.Qe3+?
1...Kd5
2.Qxe4#
1...Ke5
2.Qxe4#
1...Sxe3!
1.Qf4?
threat
2.Qxe4#
1...Kd5
2.Qxe4#
1...Sd2
2.Qd6#
1...Sd6
2.Qxd6#
1...Qe7!
1.Qf6+?
1...Kd5
2.Sc3#
1...Se5
2.Qd6#
1...gxf6!
1.Qe7?
threat
2.Qxe4#
1...Kd5
2.Qxe4#
1...Sd2
2.Qd6#
1...Se5
2.Qd6#
1...Sd6
2.Qxd6#
1...e3
2.Qe4#
1...Qxe7!
1.Qg6?
threat
2.Qxe4#
1...Kd5
2.Qxe4#
1...Ke5
2.Qxe4#
1...Sd2
2.Qd6#
1...Sd6
2.Qxd6#
1...e3
2.Qe4#
1...Qe7!
Keys
1.Sc3!
threat
2.Se2#
1...Kxc3
2.Qd2#
1...Sb2
2.Qd5#
1...Sd2
2.Qd5#
1...Sa3
2.Qd5#
1...Se3
2.fxe3#
1...Sa5
2.Qd5#
1...Se5
2.Qe3#
1...Sb6
2.Qc5#
1...Sd6
2.Qd5#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 7
REMOVED MATES = 7
Sets
Q(e);N_GUARD::QAB1(E),XQ(e)
Q(e);N_GUARD::QAB1(E)
S(a);OGATE::P(D),XS(a)
S(a);S_CUTQ(e)::QAB1(E)
Tries
Try
Q(E);CHECK
Vars
K(b);P-FLIGHT::QAB1(E),XP(c)
K(b);P_SPINP(c),S_FLIGHT::QAR1(E),XP(c)
Refutation
S(a);XQ(E)
Try
Q(E);P_PINP(c)
Threat
QAR1(E),XP(c)
Vars
K(b);N_SPINP(c),P-FLIGHT::QAB1(E),XP(c)
S(a);N_GUARD::QAR2(E)
S(a);N_GUARD::QAR2(E),XS(a)
Refutation
Q(e);
Try
Q(E);CHECK
Vars
K(b);P-FLIGHT::S(A)
S(a);N_GUARD,P_SPINS(a)::QAR2(E)
Refutation
P(f);XQ(E)
Try
Q(E);
Threat
QAR1(E),XP(c)
Vars
K(b);P-FLIGHT::QAB1(E),XP(c)
S(a);N_GUARD::QAR2(E)
S(a);N_GUARD::QAR2(E),XS(a)
P(c);::QAR1(E)
Refutation
Q(e);XQ(E)
Try
Q(E);
Threat
QAR1(E),XP(c)
Vars
K(b);P-FLIGHT::QAB1(E),XP(c)
K(b);S_FLIGHT::QAR1(E),XP(c)
S(a);N_GUARD::QAR2(E)
S(a);N_GUARD::QAR2(E),XS(a)
P(c);::QAR1(E)
Refutation
Q(e);
Actual
S(A);
Threat
S(A)
Vars
K(b);P_SPINS(a),S_FLIGHT,XS(A)::QAB1(E)
S(a);::QAR1(E)
S(a);OGATE::P(D),XS(a)
S(a);N_GUARD,SBLOCK::QAB1(E)
S(a);S_CUTQ(e)::QAB1(E)
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).