MESON Chess Problem Database
Problem Display
PID: 140366 (6QB/K4R1p/PP2N3/2PpP3/4k2r/4p3/2P1P3/4n3 w - - 0 1)
Andrade, Barry Jack da Costa
The Problemist, 1943
#2
11 + 6
SOLUTION
- SOUND
- Sets
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sxc2
- 2.Qg2#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.exf3#
- 1...d4
- 2.Qa8#
- 1...h5
- 2.Qh7#
- 2.Qg6#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...Rh1
- Tries
- 1.Kb7?
- 1...Sxc2
- 2.Qg2#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.exf3#
- 1...h5
- 2.Qh7#
- 2.Qg6#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...d4!
- 1...Sxc2
- 1.Ka8?
- 1...Sxc2
- 2.Qg2#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.exf3#
- 1...h5
- 2.Qh7#
- 2.Qg6#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...d4!
- 1...Sxc2
- 1.Kb8?
- 1...Sxc2
- 2.Qg2#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.exf3#
- 1...h5
- 2.Qh7#
- 2.Qg6#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...d4!
- 1...Sxc2
- 1.Rf1?
- 1...Sxc2
- 2.Qg2#
- 1...Rf4
- 2.Rxf4#
- 1...d4
- 2.Sg5#
- 2.Qa8#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...h5
- 2.Qh7#
- 2.Qg6#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...Sf3!
- 1...Sxc2
- 1.Qg1?
- 1...Sxc2
- 2.Qg2#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.exf3#
- 1...h5
- 2.Qg6#
- 1...h6
- 2.Qg6#
- 1...d4!
- 1...Sxc2
- 1.Qg2+?
- 1...Sf3
- 2.Qxf3#
- 2.exf3#
- 1...Sxg2!
- 1...Sf3
- 1.Qg3?
- threat
- 2.Qxh4#
- 1...Rh1
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 2.Qxf4#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 2.Qf3#
- 1...Sd3
- 2.Qg2#
- 2.Qf3#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.Qxf3#
- 2.exf3#
- 1...d4!
- threat
- 1.Qg5?
- threat
- 2.Qxh4#
- 2.Qf5#
- 1...Rh1
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 2.Qf5#
- 1...Rh2
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 2.Qf5#
- 1...Rh3
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 2.Qf5#
- 1...Rf4
- 2.Rxf4#
- 2.Qxf4#
- 1...Rg4
- 2.Qxg4#
- 2.Qf5#
- 1...Rh5
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qf4#
- 2.Qg4#
- 2.Qf5#
- 1...Sg2
- 2.Qxg2#
- 2.Qf5#
- 1...Sd3
- 2.Qg2#
- 2.Qf5#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.Qf5#
- 2.exf3#
- 1...d4!
- threat
- 1.Qg7?
- 1...Sxc2
- 2.Qg2#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.exf3#
- 1...h5
- 2.Qg6#
- 2.Qh7#
- 1...h6
- 2.Qg6#
- 2.Qh7#
- 1...d4!
- 1...Sxc2
- 1.c3?
- threat
- 2.Sg5#
- 1...d4
- 2.Qa8#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...Sf3!
- threat
- 1.c4?
- 1...dxc4
- 2.Qa8#
- 1...Rg4
- 2.Qxg4#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sc2
- 2.Qg2#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 1...d4
- 2.Sg5#
- 2.Qa8#
- 1...h5
- 2.Qh7#
- 2.Qg6#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...Sf3!
- 1...dxc4
- 1.c6?
- 1...Sxc2
- 2.Qg2#
- 1...Rg4
- 2.Qxg4#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.exf3#
- 1...h5
- 2.Qh7#
- 2.Qg6#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...d4!
- 1...Sxc2
- 1.b7?
- 1...Sxc2
- 2.Qg2#
- 1...Rg4
- 2.Qxg4#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.exf3#
- 1...h5
- 2.Qh7#
- 2.Qg6#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...d4!
- 1...Sxc2
- 1.Kb7?
- Keys
- 1.Rf8!
- 1...Sxc2
- 2.Qg2#
- 1...d4
- 2.Sg5#
- 1...Rh1
- 2.Rf4#
- 2.Qg4#
- 1...Rh2
- 2.Rf4#
- 2.Qg4#
- 1...Rh3
- 2.Rf4#
- 2.Qg4#
- 1...Rf4
- 2.Rxf4#
- 1...Rg4
- 2.Qxg4#
- 1...Rh5
- 2.Rf4#
- 2.Qg4#
- 1...Rh6
- 2.Rf4#
- 2.Qg4#
- 1...Sg2
- 2.Qxg2#
- 1...Sd3
- 2.Qg2#
- 2.cxd3#
- 2.exd3#
- 1...Sf3
- 2.exf3#
- 1...h5
- 2.Qh7#
- 2.Qg6#
- 1...h6
- 2.Qh7#
- 2.Qg6#
- 1...Sxc2
- 1.Rf8!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(d);N_GUARD::R1(I),XR(d)
- R(d);N_GUARD::QAR2(J),XR(d)
- S(a);N_GUARD,XP(A)::QAB(J)
- S(a);N_GUARD::QAB(J),XS(a)
- S(a);OGATE::P(B),XS(a)
- P(e);OGATEB::QAB(J)
- Tries
- Try
- K(H);P-FLIGHT
- Vars
- S(a);N_GUARD,XP(A)::QAB(J)
- R(d);N_GUARD::R1(I),XR(d)
- R(d);N_GUARD::QAR2(J),XR(d)
- S(a);N_GUARD::QAB(J),XS(a)
- S(a);OGATE::P(B),XS(a)
- Refutation
- P(e);
- Try
- K(H);P-FLIGHT
- Vars
- S(a);N_GUARD,XP(A)::QAB(J)
- R(d);N_GUARD::R1(I),XR(d)
- R(d);N_GUARD::QAR2(J),XR(d)
- S(a);N_GUARD::QAB(J),XS(a)
- S(a);OGATE::P(B),XS(a)
- Refutation
- P(e);
- Try
- K(H);S_FLIGHT
- Vars
- S(a);N_GUARD,XP(A)::QAB(J)
- R(d);N_GUARD::R1(I),XR(d)
- R(d);N_GUARD::QAR2(J),XR(d)
- S(a);N_GUARD::QAB(J),XS(a)
- S(a);OGATE::P(B),XS(a)
- Refutation
- P(e);
- Try
- R(I);
- Vars
- S(a);N_GUARD,XP(A)::QAB(J)
- R(d);N_GUARD::R1(I),XR(d)
- R(d);N_GUARD::QAR2(J),XR(d)
- S(a);N_GUARD::QAB(J),XS(a)
- Refutation
- S(a);
- Try
- Q(J);
- Vars
- S(a);N_GUARD,XP(A)::QAB(J)
- R(d);N_GUARD::R1(I),XR(d)
- R(d);N_GUARD::QAR2(J),XR(d)
- S(a);N_GUARD::QAB(J),XS(a)
- S(a);OGATE::P(B),XS(a)
- P(f);N_GUARD::QAB(J)
- Refutation
- P(e);
- Try
- Q(J);CHECK
- Refutation
- S(a);XQ(J)
- Try
- Q(J);
- Threat
- QAR(J),XR(d)
- Vars
- R(d);N_GUARD::QAR2(J),XR(d)
- Refutation
- P(e);
- Try
- Q(J);
- Threat
- DUALS(2)
- Refutation
- P(e);
- Try
- Q(J);
- Vars
- S(a);N_GUARD,XP(A)::QAB(J)
- R(d);N_GUARD::R1(I),XR(d)
- R(d);N_GUARD::QAR2(J),XR(d)
- S(a);N_GUARD::QAB(J),XS(a)
- S(a);OGATE::P(B),XS(a)
- Refutation
- P(e);
- Try
- P(A);
- Threat
- S(G)
- Vars
- P(e);OGATEB::QAB(J)
- R(d);N_GUARD::QAR2(J),XR(d)
- Refutation
- S(a);
- Try
- P(A);
- Vars
- P(e);OGATEB,XP(A)::QAB(J)
- R(d);N_GUARD::QAR2(J),XR(d)
- R(d);N_GUARD::R1(I),XR(d)
- S(a);N_GUARD::QAB(J)
- S(a);N_GUARD::QAB(J),XS(a)
- Refutation
- S(a);
- Try
- P(C);
- Vars
- S(a);N_GUARD,XP(A)::QAB(J)
- R(d);N_GUARD::QAR2(J),XR(d)
- R(d);N_GUARD::R1(I),XR(d)
- S(a);N_GUARD::QAB(J),XS(a)
- S(a);OGATE::P(B),XS(a)
- Refutation
- P(e);
- Try
- P(F);
- Vars
- S(a);N_GUARD,XP(A)::QAB(J)
- R(d);N_GUARD::QAR2(J),XR(d)
- R(d);N_GUARD::R1(I),XR(d)
- S(a);N_GUARD::QAB(J),XS(a)
- S(a);OGATE::P(B),XS(a)
- Refutation
- P(e);
- Try
- Actual
- R(I);
- Vars
- S(a);N_GUARD,XP(A)::QAB(J)
- P(e);SBLOCK::S(G)
- R(d);N_GUARD::R1(I),XR(d)
- R(d);N_GUARD::QAR2(J),XR(d)
- S(a);N_GUARD::QAB(J),XS(a)
- S(a);OGATE::P(B),XS(a)
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).