MESON Chess Problem Database
Problem Display
PID: 17832 (1r3r2/PR2Q3/2k3n1/pn6/5N2/2N2Rbb/6B1/K7 w - - 0 1)
Mansfield, Comins
Die Schwalbe, 1951
#2
8 + 8
| 3550 | Complete Mansfield/II | 1997 |
SOLUTION
- SOUND
- Sets
- 1...Rxf4
- 2.axb8S#
- 1...Rf5
- 2.axb8S#
- 1...Rf6
- 2.axb8S#
- 1...Rf7
- 2.axb8S#
- 1...Be1
- 2.Rxh3#
- 1...Bf2
- 2.Rxh3#
- 1...Bh2
- 2.Rxh3#
- 1...Bxf4
- 2.Rxh3#
- 1...Bh4
- 2.Rxh3#
- 1...Bd7
- 2.Rf1#
- 2.Rf2#
- 2.Rd3#
- 2.Re3#
- 2.Rxg3#
- 1...Bc8
- 2.Rf1#
- 2.Rf2#
- 2.Rd3#
- 2.Re3#
- 2.Rxg3#
- 2.axb8S#
- 1...Sa3
- 2.Qc7#
- 1...Sxc3
- 2.Rxc3#
- 2.Qc7#
- 1...Sd4
- 2.Qc7#
- 1...Sd6
- 2.Qc7#
- 1...Sxa7
- 2.Qc7#
- 1...Sc7
- 2.Qxc7#
- 1...Rxf4
- Tries
- 1.Sa4?
- threat
- 2.Rc3#
- 1...Bxg2
- 2.Qd7#
- 1...Sc3
- 2.Rxc3#
- 2.Qc7#
- 1...Sxe7!
- threat
- 1.Sxb5?
- threat
- 2.Sd4#
- 2.Rc3#
- 2.Qc7#
- 1...Rxf4
- 2.Rc3#
- 1...Bxf4
- 2.Rc3#
- 2.Rxh3#
- 1...Sxf4
- 2.Rc3#
- 1...Sxe7
- 2.Rc3#
- 1...Bd7
- 2.Rf1#
- 2.Rf2#
- 2.Ra3#
- 2.Rb3#
- 2.Rc3#
- 2.Rd3#
- 2.Re3#
- 2.Rxg3#
- 1...Rbc8
- 2.Sd4#
- 2.Rc3#
- 1...Rbd8
- 2.Rc3#
- 2.Qc7#
- 1...Rf7
- 2.Sd4#
- 2.Rc3#
- 2.axb8S#
- 1...Rfc8
- 2.Sd4#
- 2.Rc3#
- 1...Rfd8
- 2.Rc3#
- 2.Qc7#
- 1...Bf2
- 2.Rc3#
- 2.Rxh3#
- 2.Qc7#
- 1...Rxb7!
- threat
- 1.Sxh3?
- threat
- 2.Rf4#
- 2.Rf5#
- 2.Rf6#
- 2.Rf7#
- 2.Rxf8#
- 1...Rxb7
- 2.Rf6#
- 1...Rxf3
- 2.Bxf3#
- 1...Sxc3
- 2.Rxc3#
- 2.Rf6#
- 1...Bd6
- 2.Rf5#
- 1...Sd6
- 2.Qc7#
- 1...Sc7
- 2.Rf6#
- 1...Rbd8
- 2.Rf6#
- 1...Rf4
- 2.Rxf4#
- 2.axb8S#
- 1...Rf5
- 2.Rxf5#
- 1...Rf6
- 2.Rf4#
- 2.Rf5#
- 2.Rxf6#
- 1...Rf7
- 2.Rf4#
- 2.Rf5#
- 2.Rf6#
- 2.Rxf7#
- 1...Rfc8
- 2.Rf1#
- 2.Rf2#
- 2.Rd3#
- 2.Re3#
- 2.Rxg3#
- 2.Rf4#
- 2.Rf5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Rfd8
- 2.Rf6#
- 1...Rfe8
- 2.Rf1#
- 2.Rf2#
- 2.Rd3#
- 2.Re3#
- 2.Rxg3#
- 2.Rf4#
- 2.Rf5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Rg8
- 2.Rf1#
- 2.Rf2#
- 2.Rd3#
- 2.Re3#
- 2.Rxg3#
- 2.Rf4#
- 2.Rf5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Rh8
- 2.Rf1#
- 2.Rf2#
- 2.Rd3#
- 2.Re3#
- 2.Rxg3#
- 2.Rf4#
- 2.Rf5#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Bf4
- 2.Rf1#
- 2.Rf2#
- 2.Rd3#
- 2.Re3#
- 2.Rg3#
- 2.Rxf4#
- 1...Sd4
- 2.Rf6#
- 1...Sf4
- 2.Rxf4#
- 1...Sh4
- 2.Rf6#
- 1...Se5
- 2.Rf6#
- 1...Sxe7!
- threat
- 1.Qe4+?
- 1...Kd6
- 2.Qd5#
- 1...Kc5!
- 1...Kd6
- 1.Sa4?
- Keys
- 1.Sd3!
- threat
- 2.Rf6#
- 1...Rxf3
- 2.Bxf3#
- 1...Bxg2
- 2.Qd7#
- 1...Rf4
- 2.axb8S#
- 1...Rf5
- 2.Qd7#
- 1...Rf6
- 2.Rxf6#
- 1...Bf4
- 2.Rxh3#
- 1...Bd6
- 2.Qe4#
- 1...Bf5
- 2.Rxf5#
- 1...Sd6
- 2.Qc7#
- 1...Sf4
- 2.Se5#
- threat
- 1.Sd3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 5
- REMOVED MATES = 9
- Sets
- R(h);N_GUARD,XS(E)::PXR(g)=S
- R(h);N_GUARD::PXR(g)=S
- B(a);OGATE::B(B)+R(D),XB(b)
- B(a);OGATE,XS(E)::B(B)+R(D),XB(b)
- S(d);N_GUARD::QAR1(H)
- S(d);N_GUARD,XP(F)::QAR1(H)
- S(d);N_GUARD::QAR1(H),XS(d)
- Tries
- Try
- S(C);
- Threat
- B(B)+R(D),DCHECK
- Vars
- B(b);N_GUARD,XB(B)::QAB1(H)
- Refutation
- S(f);XQ(H)
- Try
- S(C);XS(d)
- Threat
- DUALS(3)
- Vars
- R(h);XS(E)::B(B)+R(D),DCHECK
- S(f);XS(E)::B(B)+R(D),DCHECK
- S(f);XQ(H)::B(B)+R(D),DCHECK
- Refutation
- R(g);XR(G)
- Try
- S(E);XB(b)
- Threat
- DUALS(5)
- Vars
- R(g);XR(G)::B(B)+R(D),DCHECK
- R(h);OGATE,P_SPINR(h),XR(D)::B(B),XR(h)
- B(a);::B(B)+R(D)
- S(d);N_GUARD,S_CUTB(a)::QAR1(H)
- S(d);::B(B)+R(D),DCHECK
- R(g);::B(B)+R(D),DCHECK
- R(h);::B(B)+R(D),XR(h)
- R(h);::B(B)+R(D),DCHECK
- S(f);::B(B)+R(D),XS(f)
- S(f);::B(B)+R(D),DCHECK
- Refutation
- S(f);XQ(H)
- Try
- Q(H);CHECK
- Vars
- K(e);P-FLIGHT::QAR1(H)
- Refutation
- K(e);P-FLIGHT
- Try
- Actual
- S(E);
- Threat
- B(B)+R(D),DCHECK
- Vars
- R(h);OGATE,P_SPINR(h),XR(D)::B(B),XR(h)
- B(b);N_GUARD,XB(B)::QAB1(H)
- R(h);N_GUARD,S_CUTB(a)::PXR(g)=S
- R(h);S_CUTB(b)::QAB1(H)
- R(h);::B(B)+R(D),DCHECK,XR(h)
- B(a);OGATE::B(B)+R(D),XB(b)
- B(a);SBLOCK::QAB(H)
- B(b);N_GUARD::B(B)+R(D),XB(b)
- S(d);N_GUARD,S_CUTB(a)::QAR1(H)
- S(f);N_GUARD,S_CUTB(a)::S(E)
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).