MESON Chess Problem Database
Problem Display
PID: 263217 (1R3rn1/p2Pn2b/2k4q/BNN1R3/K1P4b/3p4/8/2Q5 w - - 0 1)
Somma, Francesco
L'Echiquier, 1928
#2
9 + 9
| 15601 | Albrecht-Leiss-Degener Collection | 2022 |
SOLUTION
- SOUND
- Sets
- 1...Qd6
- 2.Sxa7#
- 1...Rf1
- 2.d8S#
- 1...Rf2
- 2.d8S#
- 1...Rf3
- 2.d8S#
- 1...Rf4
- 2.d8S#
- 1...Rf5
- 2.d8S#
- 1...Rf6
- 2.d8S#
- 1...Rf7
- 2.d8S#
- 1...Re8
- 2.dxe8Q#
- 2.dxe8B#
- 1...Sd5
- 2.cxd5#
- 1...Sf5
- 2.Qh1#
- 1...a6
- 2.Rb6#
- 1...Qd6
- Tries
- 1.Rd5?
- threat
- 2.Sd4#
- 2.Sxa7#
- 1...Qe3
- 2.Sxa7#
- 1...Qf4
- 2.Sxa7#
- 1...Qg7
- 2.Sxa7#
- 1...Qf6
- 2.Sxa7#
- 1...Rf4
- 2.Sxa7#
- 2.d8S#
- 1...Bf2
- 2.Sxa7#
- 1...Bf6
- 2.Sxa7#
- 1...Sf5
- 2.Sxa7#
- 1...Sc8
- 2.Sd4#
- 1...a6
- 2.Sd4#
- 2.Sa7#
- 2.Rb6#
- 1...Sxd5!
- threat
- 1.Re6+?
- 1...Kxc5
- 2.Bb4#
- 1...Qxe6!
- 1...Kxc5
- 1.Rb7?
- threat
- 2.Rc7#
- 1...Sd5
- 2.cxd5#
- 1...Qd6
- 2.Sxa7#
- 1...Rc8!
- threat
- 1.Rxf8?
- threat
- 2.d8S#
- 1...Sd5
- 2.cxd5#
- 1...Qd6
- 2.Sxa7#
- 1...Sf5
- 2.Rc8#
- 2.Qh1#
- 1...Sg6
- 2.Rc8#
- 2.Qh1#
- 1...Sc8
- 2.Rxc8#
- 2.dxc8Q#
- 2.dxc8R#
- 1...Qxf8!
- threat
- 1.Qh1+?
- 1...Rf3
- 2.d8S#
- 1...Sd5
- 2.Qxd5#
- 1...Be4!
- 1...Rf3
- 1.d8Q?
- threat
- 2.Sd4#
- 2.Sxa7#
- 2.Qc7#
- 2.Qd7#
- 1...Sd5
- 2.Qxd5#
- 2.cxd5#
- 1...Qe3
- 2.Sxa7#
- 2.Qc7#
- 2.Qd6#
- 2.Qd7#
- 1...Qf4
- 2.Sxa7#
- 2.Qc7#
- 2.Qd6#
- 2.Qd7#
- 1...Qd6
- 2.Sxa7#
- 2.Qxd6#
- 1...Qe6
- 2.Sd4#
- 2.Sxa7#
- 2.Qc7#
- 1...Rf4
- 2.Sxa7#
- 2.Qc7#
- 2.Qd7#
- 2.Qe8#
- 1...Bf2
- 2.Sxa7#
- 2.Qc7#
- 2.Qd7#
- 1...Bf5
- 2.Sd4#
- 2.Sxa7#
- 2.Qc7#
- 1...Sf5
- 2.Sxa7#
- 2.Rc8#
- 2.Qc7#
- 2.Qh1#
- 2.Qd5#
- 2.Qd7#
- 1...Sc8
- 2.Sd4#
- 2.Rxc8#
- 2.Qc7#
- 2.Qd5#
- 2.Qd7#
- 1...Sf6
- 2.Sd4#
- 2.Sxa7#
- 2.Qc7#
- 2.Qd6#
- 1...a6
- 2.Sd4#
- 2.Sa7#
- 2.Rb6#
- 2.Qb6#
- 2.Qc7#
- 2.Qd7#
- 1...Rxd8!
- threat
- 1.d8R?
- threat
- 2.Sd4#
- 2.Sxa7#
- 1...Sd5
- 2.cxd5#
- 1...Qe3
- 2.Sxa7#
- 2.Rd6#
- 1...Qf4
- 2.Sxa7#
- 2.Rd6#
- 1...Qd6
- 2.Sxa7#
- 2.Rxd6#
- 1...Rf4
- 2.Sxa7#
- 1...Bf2
- 2.Sxa7#
- 1...Sf5
- 2.Sxa7#
- 2.Rbc8#
- 2.Qh1#
- 1...Sc8
- 2.Sd4#
- 2.Rbxc8#
- 1...a6
- 2.Sd4#
- 2.Sa7#
- 2.Rb6#
- 1...Rxd8!
- threat
- 1.Rd5?
- Keys
- 1.Re8!
- threat
- 2.d8S#
- 1...Rxe8
- 2.dxe8Q#
- 2.dxe8B#
- 1...Sd5
- 2.cxd5#
- 1...Qd6
- 2.Sxa7#
- 1...Sf5
- 2.Qh1#
- 1...Sg6
- 2.R8e6#
- 1...Sc8
- 2.dxc8Q#
- 2.dxc8R#
- threat
- 1.Re8!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 8
- Sets
- Q(d);SBLOCK::S(E),XP(e)
- R(h);N_GUARD::P=S
- R(h);N_GUARD,P_PINP(C)::P=S
- R(h);OGATE::PXR(h)=Q
- S(f);OGATE::P(C),XS(f)
- S(f);N_GUARD,S_CUTB(g),S_CUTR(h)::QAB(A)
- P(e);N_GUARD::R1(I)
- Tries
- Try
- R(G);
- Threat
- DUALS(2)
- Vars
- Q(d);::S(E),XP(e)
- Q(d);P_PINP(C)::S(E),XP(e)
- B(b);::S(E),XP(e)
- S(f);::S(E),XP(e)
- S(f);::S(E)
- Refutation
- S(f);XR(G)
- Try
- R(G);CHECK
- Vars
- K(c);P-FLIGHT,S_CUTQ(d),XS(F)::B(D)
- Refutation
- Q(d);XR(G)
- Try
- R(I);
- Threat
- R1(I)
- Vars
- S(f);OGATE::P(C),XS(f)
- Q(d);SBLOCK::S(E),XP(e)
- Refutation
- R(h);
- Try
- R(I);XR(h)
- Threat
- P=S
- Vars
- S(f);OGATE::P(C),XS(f)
- Q(d);SBLOCK::S(E),XP(e)
- Refutation
- Q(d);XR(I)
- Try
- Q(A);CHECK
- Vars
- R(h);N_GUARD,P_SPINR(h),S_CUTB(g),S_CUTS(f)::P=S
- S(f);N_GUARD,P_SPINS(f)::QAB1(A),XS(f)
- Refutation
- B(g);P_SPINB(g)
- Try
- P(H);
- Threat
- DUALS(4)
- Refutation
- R(h);XQ(H)
- Try
- P(H);
- Threat
- DUALS(2)
- Vars
- S(f);OGATE::P(C),XS(f)
- R(h);P_PINP(C)::S(E),XP(e)
- B(b);::S(E),XP(e)
- Refutation
- R(h);XR(H)
- Try
- Actual
- R(I);
- Threat
- P=S
- Vars
- R(h);OGATE,XR(I)::PXR(h)=Q
- S(f);OGATE::P(C),XS(f)
- Q(d);SBLOCK::S(E),XP(e)
- S(f);N_GUARD,S_CUTB(g),S_CUTR(h)::QAB(A)
- S(f);OGATE::R(I)
- S(f);OGATE::PXS(f)=Q
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).