MESON Chess Problem Database
Problem Display
PID: 237720 (8/nrP2RQK/NpkpP1N1/1p1rp3/8/8/q1b5/n1R4B w - - 0 1)
Ellerman, Arnoldo
Arbejder-Skak, 1947
#2
9 + 11
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Rxc7
- 2.Rxc7#
- 1...Rb8
- 2.cxb8S#
- 1...e4
- 2.Se7#
- 1...Rxc7
- Tries
- 1.Rxc2+?
- 1...Qc4
- 2.Se7#
- 1...Sxc2
- 2.Se7#
- 1...Qxc2!
- 1...Qc4
- 1.Rff1?
- threat
- 2.Qd7#
- 1...Rxc7
- 2.Qxc7#
- 1...Rb8
- 2.cxb8S#
- 1...Qxa6!
- threat
- 1.Rf2?
- threat
- 2.Qd7#
- 1...Rxc7
- 2.Qxc7#
- 1...Rb8
- 2.cxb8S#
- 1...Qxa6!
- threat
- 1.Rf4?
- threat
- 2.Qd7#
- 1...Rxc7
- 2.Qxc7#
- 1...Rb8
- 2.cxb8S#
- 1...Qxa6!
- threat
- 1.Rf5?
- threat
- 2.Se7#
- 2.Qd7#
- 1...Rxc7
- 2.Qxc7#
- 1...Rb8
- 2.cxb8S#
- 1...b4
- 2.Qd7#
- 1...Sc8
- 2.Qd7#
- 1...Qxa6!
- threat
- 1.Rf6?
- threat
- 2.Qd7#
- 1...Rxc7
- 2.Qxc7#
- 1...Rb8
- 2.cxb8S#
- 1...Qxa6!
- threat
- 1.Rf8?
- threat
- 2.Qd7#
- 1...Rxc7
- 2.Qxc7#
- 1...Rb8
- 2.cxb8S#
- 1...Qxa6!
- threat
- 1.Qf8?
- threat
- 2.Qe8#
- 1...Rxc7
- 2.Rxc7#
- 1...Rb8
- 2.cxb8S#
- 1...Qxa6!
- threat
- 1.Qh8?
- threat
- 2.Qe8#
- 1...Rxc7
- 2.Rxc7#
- 1...Rb8
- 2.cxb8S#
- 1...Qxa6!
- threat
- 1.Qg8?
- threat
- 2.Qe8#
- 1...Rxc7
- 2.Rxc7#
- 1...Rb8
- 2.cxb8S#
- 1...Qxa6!
- threat
- 1.c8Q+?
- 1...Rc7
- 2.Rxc7#
- 2.Qxc7#
- 1...Sxc8!
- 1...Rc7
- 1.c8R+?
- 1...Rc7
- 2.Rfxc7#
- 2.Rcxc7#
- 1...Sxc8!
- 1...Rc7
- 1.Rxc2+?
- Keys
- 1.Rf3!
- threat
- 2.Qd7#
- 1...Qxa6
- 2.Rc3#
- 1...Rxc7
- 2.Qxc7#
- 1...Rd1
- 2.Rc3#
- 1...Rd2
- 2.Rc3#
- 1...Rd3
- 2.Se7#
- 1...Rd4
- 2.Rc3#
- 1...Rc5
- 2.Sb4#
- 1...Rb8
- 2.cxb8S#
- threat
- 1.Rf3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 6
- REMOVED MATES = 1
- Sets
- R(k);OGATE,XP(F)::R1(G),XR(k)
- R(k);OGATE::PXR(k)=S
- P(f);N_PINS(E),N_SPINR(e)::S(E)
- Tries
- Try
- R(A);CHECK,N_SPINS(E),XB(c)
- Vars
- Q(b);P_SPINQ(b)::S(E)
- S(a);XR(A)::S(E)
- Refutation
- Q(b);P_PINS(E),XR(A)
- Try
- R(G);
- Threat
- QAB1(H)
- Vars
- R(k);OGATE,P_PINQ(H),XP(F)::QAR1(H),XR(k)
- R(k);OGATE::PXR(k)=S
- Refutation
- Q(b);XS(C)
- Try
- R(G);
- Threat
- QAB1(H)
- Vars
- R(k);OGATE,P_PINQ(H),XP(F)::QAR1(H),XR(k)
- R(k);OGATE::PXR(k)=S
- Refutation
- Q(b);XS(C)
- Try
- R(G);
- Threat
- QAB1(H)
- Vars
- R(k);OGATE,P_PINQ(H),XP(F)::QAR1(H),XR(k)
- R(k);OGATE::PXR(k)=S
- Refutation
- Q(b);XS(C)
- Try
- R(G);N_SPINS(E)
- Threat
- DUALS(2)
- Vars
- R(k);OGATE,P_PINQ(H),XP(F)::QAR1(H),XR(k)
- R(k);OGATE::PXR(k)=S
- P(d);::QAB1(H)
- S(j);::QAB1(H)
- Refutation
- Q(b);XS(C)
- Try
- R(G);
- Threat
- QAB1(H)
- Vars
- R(k);OGATE,P_PINQ(H),XP(F)::QAR1(H),XR(k)
- R(k);OGATE::PXR(k)=S
- Refutation
- Q(b);XS(C)
- Try
- R(G);
- Threat
- QAB1(H)
- Vars
- R(k);OGATE,P_PINQ(H),XP(F)::QAR1(H),XR(k)
- R(k);OGATE::PXR(k)=S
- Refutation
- Q(b);XS(C)
- Try
- Q(H);
- Threat
- QAB(H)
- Vars
- R(k);OGATE,P_PINR(G),XP(F)::R1(G),XR(k)
- R(k);OGATE::PXR(k)=S
- Refutation
- Q(b);XS(C)
- Try
- Q(H);
- Threat
- QAB(H)
- Vars
- R(k);OGATE,P_PINR(G),XP(F)::R1(G),XR(k)
- R(k);OGATE::PXR(k)=S
- Refutation
- Q(b);XS(C)
- Try
- Q(H);
- Threat
- QAB(H)
- Vars
- R(k);OGATE,P_PINR(G),XP(F)::R1(G),XR(k)
- R(k);OGATE::PXR(k)=S
- Refutation
- Q(b);XS(C)
- Try
- P(F);CHECK
- Refutation
- S(j);XQ(F)
- Try
- P(F);CHECK
- Refutation
- S(j);XR(F)
- Try
- Actual
- R(G);N_PINR(e)
- Threat
- QAB1(H)
- Vars
- Q(b);N_GUARD,XS(C)::R(G)
- R(k);OGATE,P_PINQ(H),XP(F)::QAR1(H),XR(k)
- R(e);::B(B)+R(G),DCHECK
- R(e);N_PINS(E)::S(E)
- R(e);N_SPINB(c),SBLOCK::S(C)
- R(k);OGATE::PXR(k)=S
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).