MESON Chess Problem Database
Problem Display
PID: 164272 (2N2q2/Q7/8/3n1R2/4k3/3N1n1B/2P2B2/7K w - - 0 1)
Usmanto, Fatchul
Die Schwalbe, 1970
#2
8 + 4
SOLUTION
- SOUND
- Sets
- 1...Qc5
- 2.Sxc5#
- 1...Qd6
- 2.Sxd6#
- 1...Qh6
- 2.Sc5#
- 1...Qg7
- 2.Sc5#
- 2.Sd6#
- 1...Qxf5
- 2.Sd6#
- 1...Qf6
- 2.Sc5#
- 1...Qf7
- 2.Sc5#
- 2.Sd6#
- 1...Qd8
- 2.Sc5#
- 1...Qe8
- 2.Sc5#
- 2.Sd6#
- 1...Qg8
- 2.Sc5#
- 2.Sd6#
- 1...Qh8
- 2.Sc5#
- 2.Sd6#
- 1...Se1
- 2.Qd4#
- 1...Sg1
- 2.Qd4#
- 1...Sd2
- 2.Qd4#
- 1...Sh2
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sh4
- 2.Qd4#
- 1...Se5
- 2.Qd4#
- 1...Sg5
- 2.Qd4#
- 1...Sc3
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Sb4
- 2.Qe3#
- 1...Sf4
- 2.Qe3#
- 1...Sf6
- 2.Qe3#
- 1...Sc7
- 2.Qe3#
- 1...Se7
- 2.Sc5#
- 2.Sd6#
- 2.Qe3#
- 1...Qc5
- Tries
- 1.Bg1?
- threat
- 2.Sf2#
- 1...Qxf5
- 2.Sd6#
- 1...Qc5
- 2.Sxc5#
- 1...Sd4
- 2.Qxd4#
- 1...Sb6!
- threat
- 1.Qc5?
- threat
- 2.Qxd5#
- 1...Qxc5
- 2.Sxc5#
- 1...Qxf5
- 2.Sd6#
- 1...Qd6
- 2.Sxd6#
- 1...Qf7
- 2.Sd6#
- 1...Qg8
- 2.Sd6#
- 1...Se5
- 2.Qd4#
- 1...Sc3
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Sb4
- 2.Qe3#
- 1...Sf4
- 2.Qe3#
- 1...Sb6
- 2.Qe3#
- 1...Sf6
- 2.Rf4#
- 2.Qe3#
- 1...Sc7
- 2.Qe3#
- 1...Se7
- 2.Sd6#
- 2.Qe3#
- 1...Qd8!
- threat
- 1.Qa4+?
- 1...Qb4
- 2.Sc5#
- 2.Sd6#
- 1...Sd4
- 2.Qxd4#
- 1...Sb4!
- 1...Qb4
- 1.Qb7?
- threat
- 2.Qxd5#
- 1...Qxf5
- 2.Sd6#
- 1...Qc5
- 2.Sxc5#
- 2.Rf4#
- 1...Qd6
- 2.Sxd6#
- 1...Qf7
- 2.Sc5#
- 2.Sd6#
- 1...Qd8
- 2.Sc5#
- 2.Rf4#
- 1...Qg8
- 2.Sc5#
- 2.Sd6#
- 2.Rf4#
- 1...Se5!
- threat
- 1.Qe7+?
- 1...Se5
- 2.Sc5#
- 2.Sd6#
- 2.Qxe5#
- 1...Sxe7
- 2.Sc5#
- 2.Sd6#
- 1...Qxe7!
- 1...Se5
- 1.Qh7?
- threat
- 2.Rf4#
- 2.Re5#
- 2.Rf6#
- 2.Rf7#
- 2.Rxf8#
- 1...Qxf5
- 2.Sd6#
- 2.Bxf5#
- 2.Qxf5#
- 1...Qxc8
- 2.Rf4#
- 2.Re5#
- 1...Qa3
- 2.Rf4#
- 2.Re5#
- 2.Rg5#
- 2.Rh5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Qb4
- 2.Rf4#
- 2.Re5#
- 2.Rg5#
- 2.Rh5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Qc5
- 2.Sxc5#
- 2.Rf4#
- 2.Re5#
- 2.Rg5#
- 2.Rh5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Qd6
- 2.Sxd6#
- 2.Rf4#
- 2.Re5#
- 2.Rf6#
- 1...Qh6
- 2.Sc5#
- 2.Rf4#
- 2.Re5#
- 1...Qe7
- 2.Rf4#
- 2.Re5#
- 2.Rf7#
- 1...Qg7
- 2.Sc5#
- 2.Sd6#
- 2.Rf4#
- 2.Re5#
- 1...Qf6
- 2.Sc5#
- 2.Rf4#
- 2.Re5#
- 2.Rxf6#
- 1...Qf7
- 2.Sc5#
- 2.Sd6#
- 2.Rf4#
- 2.Re5#
- 2.Rxf7#
- 1...Qd8
- 2.Sc5#
- 2.Rf4#
- 2.Re5#
- 2.Rg5#
- 2.Rh5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Qe8
- 2.Sc5#
- 2.Sd6#
- 2.Rf4#
- 2.Re5#
- 2.Rf7#
- 1...Qg8
- 2.Sc5#
- 2.Sd6#
- 2.Rf4#
- 2.Re5#
- 1...Qh8
- 2.Sc5#
- 2.Sd6#
- 2.Rf4#
- 2.Re5#
- 1...Se1
- 2.Rf4#
- 2.Rf6#
- 2.Rf7#
- 2.Rxf8#
- 1...Sg1
- 2.Rf4#
- 2.Rf6#
- 2.Rf7#
- 2.Rxf8#
- 1...Sd2
- 2.Rf4#
- 2.Rf6#
- 2.Rf7#
- 2.Rxf8#
- 1...Sh2
- 2.Rf4#
- 2.Rf6#
- 2.Rf7#
- 2.Rxf8#
- 1...Sd4
- 2.Rf4#
- 1...Sh4
- 2.Rf4#
- 1...Se5
- 2.Rf4#
- 1...Sg5
- 2.Rf4#
- 1...Sc3
- 2.Re5#
- 1...Sb4
- 2.Re5#
- 1...Sf4
- 2.Re5#
- 1...Sb6
- 2.Re5#
- 1...Sf6
- 2.Re5#
- 1...Sc7
- 2.Re5#
- 1...Se7
- 2.Sc5#
- 2.Sd6#
- 2.Re5#
- 1...Se3!
- threat
- 1.Qa8?
- threat
- 2.Qxd5#
- 1...Qxf5
- 2.Sd6#
- 1...Qc5
- 2.Sxc5#
- 2.Rf4#
- 1...Qd6
- 2.Sxd6#
- 1...Qf7
- 2.Sc5#
- 2.Sd6#
- 1...Qd8
- 2.Sc5#
- 2.Rf4#
- 1...Qg8
- 2.Sc5#
- 2.Sd6#
- 2.Rf4#
- 1...Se5!
- threat
- 1.Bg1?
- Keys
- 1.Qf7!
- threat
- 2.Qxd5#
- 1...Qxf7
- 2.Sc5#
- 2.Sd6#
- 1...Se3
- 2.Rf4#
- 1...Se5
- 2.Rxe5#
- 1...Qc5
- 2.Sxc5#
- 1...Qd6
- 2.Sxd6#
- 1...Qd8
- 2.Sc5#
- 1...Qg8
- 2.Sc5#
- 2.Sd6#
- 1...Sc3
- 2.Rf4#
- 1...Sb4
- 2.Rf4#
- 1...Sf4
- 2.Rxf4#
- 1...Sb6
- 2.Rf4#
- 1...Sf6
- 2.Rf4#
- 1...Sc7
- 2.Rf4#
- 1...Se7
- 2.Sc5#
- 2.Sd6#
- 2.Rf4#
- threat
- 1.Qf7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 7
- ADDED MATES = 1
- REMOVED MATES = 10
- Sets
- Q(d);N_GUARD::S(D),XQ(d)
- Q(d);N_GUARD::S(H),XQ(d)
- Q(d);N_GUARD,P_PINB(E)::S(D)
- Q(d);N_GUARD,XR(F)::S(H)
- Q(d);N_GUARD::S(D)
- S(a);N_GUARD::QAR1(G)
- S(a);N_GUARD::QAR1(G),XS(a)
- S(c);N_GUARD::QAR1(G)
- S(c);N_GUARD::QAR1(G),XS(c)
- Tries
- Try
- B(C);
- Threat
- S(D)
- Vars
- Q(d);N_GUARD,XR(F)::S(H)
- Q(d);N_GUARD::S(D),XQ(d)
- S(a);N_GUARD::QAR1(G),XS(a)
- Refutation
- S(c);
- Try
- Q(G);
- Threat
- QAB1(G),XS(c)
- Vars
- Q(d);XQ(G)::S(D),XQ(d)
- Q(d);N_GUARD,XR(F)::S(H)
- Q(d);N_GUARD::S(H),XQ(d)
- Q(d);N_GUARD::S(H)
- S(a);N_GUARD::QAR1(G)
- S(c);N_GUARD::QAR1(G)
- S(c);N_GUARD::QAR1(G),XS(c)
- Refutation
- Q(d);
- Try
- Q(G);CHECK
- Vars
- S(a);N_GUARD,P_SPINS(a)::QAR1(G),XS(a)
- Refutation
- S(c);P_SPINS(c)
- Try
- Q(G);P_PINS(c)
- Threat
- QAB1(G),XS(c)
- Vars
- Q(d);N_GUARD,XR(F)::S(H)
- Q(d);N_GUARD::S(H),XQ(d)
- Refutation
- S(a);
- Try
- Q(G);CHECK
- Refutation
- Q(d);XQ(G)
- Try
- Q(G);
- Threat
- DUALS(5)
- Vars
- S(a);::QAB(G)+R(F),DCHECK
- S(c);::QAB(G)+R(F),DCHECK
- Refutation
- S(c);
- Try
- Q(G);P_PINS(c)
- Threat
- QAB1(G),XS(c)
- Vars
- Q(d);N_GUARD,XR(F)::S(H)
- Q(d);N_GUARD::S(H),XQ(d)
- Refutation
- S(a);
- Try
- Actual
- Q(G);
- Threat
- QAB1(G),XS(c)
- Vars
- S(c);N_GUARD::R1(F)
- S(a);N_GUARD::R1(F),XS(a)
- Q(d);N_GUARD::S(D),XQ(d)
- Q(d);N_GUARD::S(H),XQ(d)
- Q(d);N_GUARD::S(D)
- S(c);N_GUARD::R1(F),XS(c)
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).