MESON Chess Problem Database
Problem Display
PID: 87420 (8/pR6/P4P2/KN6/8/1k1PP2p/6qP/2Q3n1 w - - 0 1)
Andrade, Barry Jack da Costa
American Chess Problemist, 1950
#2
9 + 5
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Ka2
- 2.Sc3#
- 1...Qf1
- 2.Sc3#
- 1...Qh1
- 2.Qb1#
- 1...Qf3
- 2.Qb1#
- 1...Qe4
- 2.Qb1#
- 1...Qd5
- 2.Qb1#
- 1...Qc6
- 2.Qb1#
- 1...Qxb7
- 2.Qb1#
- 1...Qa2+
- 2.Sa3#
- 1...Qb2
- 2.Qc4#
- 1...Qc2
- 2.Qa3#
- 1...Qd2+
- 2.Sc3#
- 1...Qe2
- 2.Sc3#
- 1...Qf2
- 2.Sc3#
- 1...Qxh2
- 2.Sc3#
- 1...Qg3
- 2.Sc3#
- 2.Qb1#
- 1...Qg4
- 2.Qb1#
- 1...Qg5
- 2.Qb1#
- 1...Qg6
- 2.Sc3#
- 2.Qb1#
- 1...Qg7
- 2.Qb1#
- 1...Qg8
- 2.Sc3#
- 2.Qb1#
- 1...Se2
- 2.Qb1#
- 1...Sf3
- 2.Sc3#
- 1...Ka2
- Tries
- 1.Rb8?
- 1...Qa2+
- 2.Sa3#
- 1...Qd2+
- 2.Sc3#
- 1...Ka2
- 2.Sc3#
- 1...Qf1
- 2.Sc3#
- 1...Qh1
- 2.Qb1#
- 1...Qf3
- 2.Qb1#
- 1...Qe4
- 2.Qb1#
- 1...Qd5
- 2.Qb1#
- 1...Qc6
- 2.Qb1#
- 1...Qb7
- 2.Qb1#
- 1...Qa8
- 2.Qb1#
- 1...Qb2
- 2.Qc4#
- 1...Qc2
- 2.Qa3#
- 1...Qe2
- 2.Sc3#
- 1...Qf2
- 2.Sc3#
- 1...Qg3
- 2.Qb1#
- 1...Qg4
- 2.Qb1#
- 1...Qg5
- 2.Qb1#
- 1...Qg6
- 2.Sc3#
- 2.Qb1#
- 1...Qg7
- 2.Qb1#
- 1...Qg8
- 2.Qb1#
- 1...Se2
- 2.Qb1#
- 1...Sf3
- 2.Sc3#
- 1...Qxh2!
- 1...Qa2+
- 1.e4?
- threat
- 2.Sc3#
- 1...Qa2+
- 2.Sa3#
- 1...Ka2
- 2.Sc3#
- 1...Qxe4
- 2.Qb1#
- 1...Qb2
- 2.Qc4#
- 1...Qc2
- 2.Qa3#
- 1...Qg5
- 2.Qb1#
- 1...Qg7
- 2.Qb1#
- 1...Qf2!
- threat
- 1.Rb8?
- Keys
- 1.f7!
- 1...Qa2+
- 2.Sa3#
- 1...Qd2+
- 2.Sc3#
- 1...Ka2
- 2.Sc3#
- 1...Qxb7
- 2.Qb1#
- 1...Qxh2
- 2.Sc3#
- 1...Qf1
- 2.Sc3#
- 1...Qh1
- 2.Qb1#
- 1...Qf3
- 2.Qb1#
- 1...Qe4
- 2.Qb1#
- 1...Qd5
- 2.Qb1#
- 1...Qc6
- 2.Qb1#
- 1...Qb2
- 2.Qc4#
- 1...Qc2
- 2.Qa3#
- 1...Qe2
- 2.Sc3#
- 1...Qf2
- 2.Sc3#
- 1...Qg3
- 2.Sc3#
- 2.Qb1#
- 1...Qg4
- 2.Qb1#
- 1...Qg5
- 2.Qb1#
- 1...Qg6
- 2.Qb1#
- 1...Qg7
- 2.Sc3#
- 1...Qg8
- 2.Sc3#
- 2.Qb1#
- 2.fxg8Q#
- 2.fxg8B#
- 1...Se2
- 2.Qb1#
- 1...Sf3
- 2.Sc3#
- 1...Qa2+
- 1.f7!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- K(c);S_FLIGHT::S(F)
- Q(b);N_GUARD::R(I)+S(F)
- Q(b);N_GUARD::QAR2(A)
- Q(b);N_GUARD,P_PINS(F)::QAR2(A)
- Q(b);N_GUARD,XR(I)::QAR2(A)
- Q(b);CHECK,N_GUARD,SBLOCK::R(I)+S(F)
- Q(b);SBLOCK::QAB1(A)
- Q(b);SBLOCK::QAR1(A)
- Q(b);CHECK,N_GUARD::R(I)+S(F)
- Q(b);N_GUARD,XP(B)::R(I)+S(F)
- S(a);S_CUTQ(b)::QAR2(A)
- S(a);S_CUTQ(b)::R(I)+S(F)
- Tries
- Try
- R(I);
- Vars
- Q(b);CHECK,N_GUARD,SBLOCK::R(I)+S(F)
- Q(b);CHECK,N_GUARD::R(I)+S(F)
- K(c);S_FLIGHT::S(F)
- Q(b);N_GUARD::R(I)+S(F)
- Q(b);N_GUARD::QAR2(A)
- Q(b);N_GUARD,P_PINS(F)::QAR2(A)
- Q(b);SBLOCK::QAB1(A)
- Q(b);SBLOCK::QAR1(A)
- S(a);S_CUTQ(b)::QAR2(A)
- S(a);S_CUTQ(b)::R(I)+S(F)
- Refutation
- Q(b);XP(B)
- Try
- P(D);
- Threat
- R(I)+S(F)
- Vars
- Q(b);CHECK,SBLOCK::R(I)+S(F)
- K(c);S_FLIGHT::S(F)
- Q(b);N_GUARD,XP(D)::QAR2(A)
- Q(b);SBLOCK::QAB1(A)
- Q(b);SBLOCK::QAR1(A)
- Q(b);N_GUARD,P_PINS(F)::QAR2(A)
- Q(b);N_GUARD::QAR2(A)
- Refutation
- Q(b);
- Try
- Actual
- P(H);
- Vars
- Q(b);CHECK,N_GUARD,SBLOCK::R(I)+S(F)
- Q(b);CHECK,N_GUARD::R(I)+S(F)
- K(c);S_FLIGHT::S(F)
- Q(b);N_GUARD,XR(I)::QAR2(A)
- Q(b);N_GUARD,XP(B)::R(I)+S(F)
- Q(b);N_GUARD::R(I)+S(F)
- Q(b);N_GUARD::QAR2(A)
- Q(b);N_GUARD,P_PINS(F)::QAR2(A)
- Q(b);SBLOCK::QAB1(A)
- Q(b);SBLOCK::QAR1(A)
- S(a);S_CUTQ(b)::QAR2(A)
- S(a);S_CUTQ(b)::R(I)+S(F)
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).