PID: 146439 (4K3/Q2NpN2/2n1k1n1/4B3/4B3/8/3r4/3R1rq1 w - - 0 1)
Roe, RE
Chess, 1955
#2
7 + 7
SOLUTION
SOUND
Sets
1...Qf2
2.Sg5#
1...Qh2
2.Sc5#
2.Sg5#
1...Qd4
2.Sg5#
1...Qc5
2.Sxc5#
2.Sg5#
1...Qb6
2.Sg5#
1...Qxa7
2.Sg5#
1...Qh1
2.Sc5#
2.Sg5#
1...Qg2
2.Sc5#
1...Qg3
2.Sc5#
1...Qg4
2.Sc5#
1...Qg5
2.Sc5#
2.Sxg5#
1...Rff2
2.Sc5#
1...Ra2
2.Qxa2#
1...Rdf2
2.Sc5#
1...Rd4
2.Sc5#
1...Rxd7
2.Qxd7#
1...Sb4
2.Sd8#
1...Sd4
2.Sc5#
2.Sd8#
1...Sa5
2.Sd8#
1...Sxa7
2.Sd8#
1...Sb8
2.Sd8#
1...Sd8
2.Sxd8#
1...Sf4
2.Sf8#
1...Sh4
2.Sf8#
1...Sf8
2.Sxf8#
1...Sh8
2.Sf8#
Tries
1.Qd4?
threat
2.Sc5#
1...Qxd4
2.Sg5#
1...Scxe5
2.Sd8#
1...Rc2
2.Qd5#
1...Sgxe5!
1.Qa2+?
1...Rd5
2.Qxd5#
1...Rxa2!
Keys
1.Qf2!
threat
2.Sc5#
1...Qxf2
2.Sg5#
1...Rxd7
2.Bf5#
1...Rc2
2.Bd5#
2.Bf5#
1...Rd5
2.Bxd5#
2.Bf5#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 1
ADDED MATES = 0
REMOVED MATES = 19
Sets
Q(b);N_GUARD::S(F)
Q(b);N_GUARD,XQ(D)::S(F)
Q(b);N_GUARD::S(E)
R(a);S_CUTQ(b)::S(E)
R(c);N_GUARD::QAB(D),XR(c)
R(c);S_CUTQ(b)::S(E)
R(c);OGATE,XS(E)::QAB1(D),XR(c)
S(d);N_GUARD::S(F)
S(d);N_GUARD,XQ(D)::S(F)
S(d);N_GUARD::S(F),XS(d)
S(f);N_GUARD::S(E)
S(f);N_GUARD::S(E),XS(f)
Tries
Try
Q(D);
Threat
S(E)
Vars
Q(b);N_GUARD,XQ(D)::S(F)
S(d);N_GUARD,XB(C)::S(F)
R(c);N_GUARD::QAB1(D)
Refutation
S(f);XB(C)
Try
Q(D);CHECK
Vars
R(c);N_GUARD,P_SPINR(c)::QAB1(D),XR(c)
Refutation
R(c);XQ(D)
Actual
Q(D);
Threat
S(E)
Vars
Q(b);N_GUARD,XQ(D)::S(F)
R(c);XS(E)::B(B)
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).