MESON Chess Problem Database
Problem Display
PID: 246662 (6K1/1Q1BrP2/R7/r3kNB1/1RpNP2n/3n1p2/q5p1/8 w - - 0 1)
Morra, Juan Carlos
El Ajedrez Espanol, 1959
#2
10 + 9
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Ra3
- 2.Qd5#
- 1...Ra4
- 2.Qd5#
- 1...Rd5
- 2.Qxd5#
- 1...Rxa6
- 2.Qd5#
- 1...Re6
- 2.Rxe6#
- 1...Rxd7
- 2.Re6#
- 1...Rxf7
- 2.Re6#
- 1...Re8+
- 2.fxe8Q#
- 2.fxe8R#
- 1...Sf4
- 2.Bf6#
- 1...Sc5
- 2.Qd5#
- 1...Sxf5
- 2.Sxf3#
- 1...Sg6
- 2.Sxf3#
- 1...c3
- 2.Sc6#
- 1...Ra3
- Tries
- 1.Ba4?
- threat
- 2.Qxe7#
- 1...Re8+
- 2.fxe8Q#
- 2.fxe8R#
- 1...Rxa6
- 2.Qd5#
- 1...Rxb7
- 2.Re6#
- 1...Rxf7
- 2.Re6#
- 1...Sxf5
- 2.Sxf3#
- 1...Re6
- 2.Rxe6#
- 1...Rc7
- 2.Re6#
- 1...Rd7
- 2.Re6#
- 1...Sf4
- 2.Bf6#
- 1...Sc5
- 2.Qd5#
- 1...Sg6
- 2.Sxf3#
- 1...c3!
- threat
- 1.Bb5?
- threat
- 2.Qd5#
- 2.Qxe7#
- 1...Re8+
- 2.fxe8Q#
- 2.fxe8R#
- 1...Rxb5
- 2.Qxe7#
- 1...Rxa6
- 2.Qd5#
- 1...Rxb7
- 2.Re6#
- 1...Rxf7
- 2.Re6#
- 2.Qd5#
- 1...Sxb4
- 2.Qxe7#
- 1...Sxf5
- 2.Sxf3#
- 2.Qd5#
- 1...Re6
- 2.Rxe6#
- 2.Qd5#
- 1...Rc7
- 2.Re6#
- 2.Qd5#
- 1...Rd7
- 2.Re6#
- 1...Sf4
- 2.Bf6#
- 1...Sc5
- 2.Qd5#
- 1...Sg6
- 2.Sxf3#
- 2.Qd5#
- 1...c3!
- threat
- 1.Be8?
- threat
- 2.Qxe7#
- 1...Rxe8+
- 2.fxe8Q#
- 2.fxe8R#
- 1...Rxa6
- 2.Qd5#
- 1...Rxb7
- 2.Re6#
- 1...Rxf7
- 2.Re6#
- 1...Sxf5
- 2.Sxf3#
- 1...Re6
- 2.Rxe6#
- 1...Rc7
- 2.Re6#
- 1...Rd7
- 2.Re6#
- 1...Sf4
- 2.Bf6#
- 1...Sc5
- 2.Qd5#
- 1...Sg6
- 2.Sxf3#
- 1...c3!
- threat
- 1.Rb5+?
- 1...Sc5
- 2.Qd5#
- 1...Rxb5!
- 1...Sc5
- 1.Rxa5+?
- 1...Sc5
- 2.Rxc5#
- 2.Qd5#
- 1...Qxa5!
- 1...Sc5
- 1.f8Q?
- threat
- 2.Qxe7#
- 2.Qf6#
- 2.Qfb8#
- 1...Rg7+
- 2.Qxg7#
- 1...Rxa6
- 2.Qd5#
- 1...Rxd7
- 2.Re6#
- 2.Qf6#
- 1...Sxf5
- 2.Sxf3#
- 2.Qf6#
- 1...Rd5
- 2.Qxd5#
- 2.Qxe7#
- 1...Rc5
- 2.Qxe7#
- 2.Qf6#
- 1...Re6
- 2.Rxe6#
- 1...Rf7
- 2.Re6#
- 2.Qd6#
- 2.Qfb8#
- 1...Rh7
- 2.Re6#
- 2.Qd6#
- 2.Qf6#
- 2.Qfb8#
- 1...Re8
- 2.Qxe8#
- 1...Sf4
- 2.Bf6#
- 2.Qf6#
- 2.Qfb8#
- 1...Sc5
- 2.Qd5#
- 2.Qf6#
- 2.Qfb8#
- 1...Sg6
- 2.Sxf3#
- 2.Qf6#
- 2.Qfb8#
- 1...c3+!
- threat
- 1.Ba4?
- Keys
- 1.Bc8!
- threat
- 2.Qxe7#
- 1...Re8+
- 2.fxe8Q#
- 2.fxe8R#
- 1...Rxa6
- 2.Qd5#
- 1...Rxb7
- 2.Re6#
- 1...Rxf7
- 2.Re6#
- 1...Sxf5
- 2.Sxf3#
- 1...c3
- 2.Sc6#
- 1...Re6
- 2.Rxe6#
- 1...Rc7
- 2.Re6#
- 1...Rd7
- 2.Re6#
- 1...Sf4
- 2.Bf6#
- 1...Sc5
- 2.Qd5#
- 1...Sg6
- 2.Sxf3#
- threat
- 1.Bc8!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 3
- Sets
- R(g);N_GUARD::QAR1(G)
- R(g);N_GUARD::QAR1(G),XR(g)
- R(g);N_GUARD,XR(F)::QAR1(G)
- R(i);N_GUARD::R1(F),XR(i)
- R(i);N_GUARD,XB(H)::R1(F)
- R(i);N_GUARD,XP(I)::R1(F)
- R(i);CHECK,OGATE::PXR(i)=Q
- S(c);SBLOCK::B(E)
- S(c);S_CUTR(g)::QAR1(G)
- S(f);N_GUARD,XS(D)::S(B),XP(d)
- S(f);N_GUARD::S(B),XP(d)
- P(e);P_PINP(I)::S(B)
- Tries
- Try
- B(H);
- Threat
- QAR2(G),XR(i)
- Vars
- R(i);CHECK,OGATE::PXR(i)=Q
- R(g);N_GUARD,XR(F)::QAR1(G)
- R(i);N_GUARD,XQ(G)::R1(F)
- R(i);N_GUARD,XP(I)::R1(F)
- S(f);N_GUARD,XS(D)::S(B),XP(d)
- R(i);N_GUARD::R1(F),XR(i)
- R(i);N_GUARD::R1(F)
- S(c);SBLOCK::B(E)
- S(c);S_CUTR(g)::QAR1(G)
- S(f);N_GUARD::S(B),XP(d)
- Refutation
- P(e);P_PINP(I)
- Try
- B(H);
- Threat
- DUALS(2)
- Vars
- R(i);CHECK,OGATE::PXR(i)=Q
- R(g);XB(H)::QAR2(G),XR(i)
- R(g);XR(F)::QAR1(G)
- R(i);N_GUARD,XQ(G)::R1(F)
- S(c);XR(A)::QAR2(G),XR(i)
- R(i);N_GUARD::R1(F)
- S(c);SBLOCK::B(E)
- S(c);::QAR1(G)
- Refutation
- P(e);P_PINP(I)
- Try
- B(H);
- Threat
- QAR2(G),XR(i)
- Vars
- R(i);CHECK,OGATE,XB(H)::PXR(i)=Q
- R(g);N_GUARD,XR(F)::QAR1(G)
- R(i);N_GUARD,XQ(G)::R1(F)
- R(i);N_GUARD,XP(I)::R1(F)
- S(f);N_GUARD,XS(D)::S(B),XP(d)
- R(i);N_GUARD::R1(F),XR(i)
- R(i);N_GUARD::R1(F)
- S(c);SBLOCK::B(E)
- S(c);S_CUTR(g)::QAR1(G)
- S(f);N_GUARD::S(B),XP(d)
- Refutation
- P(e);P_PINP(I)
- Try
- R(A);CHECK
- Vars
- S(c);P_SPINS(c)::QAR1(G)
- Refutation
- R(g);XR(A)
- Try
- R(F);CHECK,XR(g)
- Refutation
- Q(a);XR(F)
- Try
- P(I);
- Threat
- DUALS(3)
- Vars
- R(i);CHECK,N_GUARD::QAB(I),XR(i)
- R(g);N_GUARD,XR(F)::QAR1(G)
- R(i);N_GUARD::R1(F),XR(i)
- R(i);OGATEB,P_PINQ(I)::QAR(I),XR(i)
- Refutation
- P(e);CHECK
- Try
- Actual
- B(H);
- Threat
- QAR2(G),XR(i)
- Vars
- R(i);CHECK,OGATE::PXR(i)=Q
- R(g);N_GUARD,XR(F)::QAR1(G)
- R(i);N_GUARD,XQ(G)::R1(F)
- R(i);N_GUARD,XP(I)::R1(F)
- S(f);N_GUARD,XS(D)::S(B),XP(d)
- P(e);P_PINP(I)::S(B)
- R(i);N_GUARD::R1(F),XR(i)
- R(i);N_GUARD::R1(F)
- S(c);SBLOCK::B(E)
- S(c);S_CUTR(g)::QAR1(G)
- S(f);N_GUARD::S(B),XP(d)
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).