MESON Chess Problem Database
Problem Display
PID: 21451 (4N3/B2n2Kp/1rp4Q/p1krn3/P4R2/1RPp2p1/1N1P2B1/8 w - - 0 1)
Mansfield, Comins
4th Prize, Chess Amateur (The), 1919
#2
11 + 10
| 2681 | All Change Here! | 1919 |
| 3202 | Complete Mansfield/I | 1996 |
| 721 | Variantim | 2005 |
| 133 | The Problemist Supplement | 2007 |
SOLUTION
- SOUND
- Sets
- 1...Rd4
- 2.cxd4#
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sg4
- 2.Rc4#
- 1...Sg6
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...Rd4
- Tries
- 1.Kg8?
- 1...Rd4
- 2.cxd4#
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sg4
- 2.Rc4#
- 1...Sg6
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...Sf6+!
- 1...Rd4
- 1.Sd6?
- threat
- 2.Se4#
- 2.Sb7#
- 1...Sf6
- 2.Sb7#
- 1...Rd4
- 2.Sb7#
- 2.cxd4#
- 1...Rxd6!
- threat
- 1.Bh1?
- 1...Rd4
- 2.cxd4#
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sg4
- 2.Rc4#
- 1...Sg6
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...g2!
- 1...Rd4
- 1.Bf3?
- 1...Sxf3
- 2.Rc4#
- 1...Rd4
- 2.cxd4#
- 1...Rd6
- 2.Qxd6#
- 1...Sc4
- 2.Rxc4#
- 1...Sg4
- 2.Rc4#
- 1...Sg6
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...g2!
- 1...Sxf3
- 1.Rbb4?
- 1...axb4
- 2.cxb4#
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Rbc4#
- 2.Rfc4#
- 1...Sc4
- 2.Rbxc4#
- 2.Rfxc4#
- 1...Sg4
- 2.Rbc4#
- 2.Rfc4#
- 1...Sg6
- 2.Rbc4#
- 2.Rfc4#
- 1...Sf7
- 2.Rbc4#
- 2.Rfc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...Rd4!
- 1...axb4
- 1.Rxb6?
- threat
- 2.Rb5#
- 2.Rxc6#
- 1...Sg6
- 2.Rc4#
- 2.Rb5#
- 1...Sf6
- 2.Rb3#
- 2.Rbb4#
- 2.Rb5#
- 2.Ra6#
- 2.Rb7#
- 2.Rb8#
- 1...Sxb6!
- threat
- 1.Rfb4?
- 1...Rd4
- 2.cxd4#
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sg4
- 2.Rc4#
- 1...Sg6
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...axb4!
- 1...Rd4
- 1.Rd4?
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Sxd3#
- 2.Rc4#
- 1...Sc4
- 2.Sxd3#
- 2.Rxc4#
- 1...Sg4
- 2.Sxd3#
- 2.Rc4#
- 1...Sg6
- 2.Sxd3#
- 2.Rc4#
- 1...Sf7
- 2.Sxd3#
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...Rxd4!
- 1...Rd6
- 1.Re4?
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sg4
- 2.Rc4#
- 1...Sg6
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...Rd4!
- 1...Rd6
- 1.Rg4?
- 1...Rd4
- 2.cxd4#
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sg6
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...Sxg4!
- 1...Rd4
- 1.Rh4?
- 1...Rd4
- 2.cxd4#
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sg6
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...Sg4!
- 1...Rd4
- 1.Qh5?
- 1...Rd4
- 2.cxd4#
- 1...Rd6
- 2.Rc4#
- 1...Sf3
- 2.Sxd3#
- 2.Rc4#
- 1...Sc4
- 2.Sxd3#
- 2.Rxc4#
- 1...Sg4
- 2.Sxd3#
- 2.Rc4#
- 1...Sg6
- 2.Sxd3#
- 2.Rc4#
- 1...Sf7
- 2.Sxd3#
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...h6!
- 1...Rd4
- 1.Qxc6+?
- 1...Sxc6
- 2.Rb5#
- 2.Rc4#
- 1...Kxc6!
- 1...Sxc6
- 1.Qxh7?
- 1...Rd4
- 2.cxd4#
- 1...Sf3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sg4
- 2.Rc4#
- 1...Sg6
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...Rd6!
- 1...Rd4
- 1.Kg8?
- Keys
- 1.Rf5!
- 1...Rd4
- 2.Qxc6#
- 1...Rd6
- 2.Qxd6#
- 1...Sf3
- 2.Qd6#
- 1...Sc4
- 2.Sxd3#
- 1...Sg4
- 2.Qd6#
- 1...Sg6
- 2.Qe3#
- 1...Sf7
- 2.Qe3#
- 1...Sf6
- 2.Bxb6#
- 1...Sb8
- 2.Bxb6#
- 1...Sf8
- 2.Bxb6#
- 1...Rd4
- 1.Rf5!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 6
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(e);OGATE::P(E),XR(e)
- R(e);N_GUARD::QAB1(H),XR(e)
- S(f);N_GUARD::R1(G)
- S(f);N_GUARD::R1(G),XS(f)
- S(i);N_GUARD::B(I),XR(g)
- Tries
- Try
- K(J);P-FLIGHT
- Vars
- R(e);OGATE::P(E),XR(e)
- R(e);N_GUARD::QAB1(H),XR(e)
- S(f);N_GUARD::R1(G)
- S(f);N_GUARD::R1(G),XS(f)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- S(i);CHECK
- Try
- S(K);
- Threat
- DUALS(2)
- Vars
- S(i);::S(K)
- Refutation
- R(e);XS(K)
- Try
- B(C);
- Vars
- R(e);OGATE::P(E),XR(e)
- R(e);N_GUARD::QAB1(H),XR(e)
- S(f);N_GUARD::R1(G)
- S(f);N_GUARD::R1(G),XS(f)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- P(b);
- Try
- B(C);
- Vars
- S(f);N_GUARD,XB(C)::R1(G)
- R(e);OGATE::P(E),XR(e)
- R(e);N_GUARD::QAB1(H),XR(e)
- S(f);N_GUARD::R1(G),XS(f)
- S(f);N_GUARD::R1(G)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- P(b);
- Try
- R(D);
- Vars
- P(c);OGATE,XR(D)::P(E),XP(c)
- R(e);N_GUARD::QAB1(H),XR(e)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- R(e);
- Try
- R(D);XR(g)
- Threat
- DUALS(2)
- Refutation
- S(i);P_SPINS(i),XR(D)
- Try
- R(G);
- Vars
- R(e);OGATE::P(E),XR(e)
- R(e);N_GUARD::QAB1(H),XR(e)
- S(f);N_GUARD::R1(G)
- S(f);N_GUARD::R1(G),XS(f)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- P(c);XR(G)
- Try
- R(G);
- Vars
- R(e);N_GUARD::QAB1(H),XR(e)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- R(e);XR(G)
- Try
- R(G);
- Vars
- R(e);N_GUARD::QAB1(H),XR(e)
- S(f);N_GUARD::R1(G)
- S(f);N_GUARD::R1(G),XS(f)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- R(e);
- Try
- R(G);
- Vars
- R(e);OGATE::P(E),XR(e)
- R(e);N_GUARD::QAB1(H),XR(e)
- S(f);N_GUARD::R1(G)
- S(f);N_GUARD::R1(G),XS(f)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- S(f);XR(G)
- Try
- R(G);
- Vars
- R(e);OGATE::P(E),XR(e)
- R(e);N_GUARD::QAB1(H),XR(e)
- S(f);N_GUARD::R1(G)
- S(f);N_GUARD::R1(G),XS(f)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- S(f);
- Try
- Q(H);
- Vars
- R(e);OGATE,P_SPINS(f)::P(E),XR(e)
- R(e);P_SPINS(f)::R1(G)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- P(j);
- Try
- Q(H);CHECK,XP(h)
- Refutation
- K(d);N_SPINR(g),P-FLIGHT,P_SPINR(e),XQ(H)
- Try
- Q(H);XP(j)
- Vars
- R(e);OGATE::P(E),XR(e)
- S(f);N_GUARD::R1(G)
- S(f);N_GUARD::R1(G),XS(f)
- S(i);N_GUARD::B(I),XR(g)
- Refutation
- R(e);
- Try
- Actual
- R(G);
- Vars
- R(e);P_SPINS(f)::QAR1(H),XP(h)
- R(e);N_GUARD,P_SPINS(f)::QAB1(H),XR(e)
- S(f);N_SPINR(g),P_SPINR(e)::QAB1(H)
- S(f);N_GUARD,N_SPINR(g),P_SPINR(e),SBLOCK::S(A),XP(a)
- S(f);N_SPINR(g),P_SPINR(e)::QAB(H)
- S(i);N_GUARD::B(I),XR(g)
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).