MESON Chess Problem Database

Problem Display
PID: 222423 (N4bR1/rB6/2p2P2/1PPkN1pb/2pqR3/2Pp4/P4QPB/1K6 w - - 0 1)

Coe, WR

1st Prize, Sheffield Independent, 1883

N4bR1/rB6/2p2P2/1PPkN1pb/2pqR3/2Pp4/P4QPB/1K6

#2

14 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Sc7#
    • 1...Qxe5
      • 2.Rxe5#
    • 1...Qxe4
      • 2.Sc7#
  • Tries
    • 1.Sxc6?
      • threat
        • 2.Qxd4#
      • 1...Kxc5
        • 2.Rxg5#
      • 1...Qxf2
        • 2.Re5#
      • 1...Qxc3
        • 2.Sb4#
        • 2.Sxa7#
        • 2.Se7#
      • 1...Qxc5
        • 2.Sb4#
        • 2.Se7#
        • 2.Qf5#
      • 1...Qxf6
        • 2.Sb4#
        • 2.Se7#
      • 1...Qxe4
        • 2.Sc7#
      • 1...Bxc5
        • 2.Sb4#
        • 2.Sxa7#
        • 2.Se7#
      • 1...Qe3
        • 2.Qf5#
      • 1...Qe5
        • 2.Rxe5#
      • 1...Kxe4!
    • 1.Sd7?
      • threat
        • 2.Bxc6#
        • 2.Qxd4#
      • 1...Qxf2
        • 2.Bxc6#
        • 2.Re5#
      • 1...Qxc3
        • 2.Bxc6#
      • 1...Qxc5
        • 2.Qf5#
      • 1...Qxf6
        • 2.Sxf6#
      • 1...Qxe4
        • 2.Sc7#
      • 1...Rxb7
        • 2.Qxd4#
      • 1...Bxc5
        • 2.Bxc6#
      • 1...Qe5
        • 2.Rxe5#
      • 1...Qe3
        • 2.Bxc6#
        • 2.Qf5#
      • 1...Ra6
        • 2.Qxd4#
      • 1...Kxe4!
    • 1.Sc7+?
      • 1...Kxc5
        • 2.Sd7#
        • 2.Qxd4#
      • 1...Kxe4!
    • 1.Bxc6+?
      • 1...Kxc5
        • 2.Qxd4#
      • 1...Ke6!
    • 1.Rxd4+?
      • 1...Ke6
        • 2.Sc7#
      • 1...Kxc5!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Qxd4#
      • 1...Kxe4
        • 2.Qf3#
      • 1...Kxc5
        • 2.Rxg5#
      • 1...Qxf2
        • 2.Re5#
      • 1...Qxc3
        • 2.Bxc6#
      • 1...Qxc5
        • 2.Qf5#
      • 1...Qxf6
        • 2.Sxf6#
      • 1...Qxe4
        • 2.Sc7#
      • 1...Bxc5
        • 2.Bxc6#
      • 1...Qe3
        • 2.Qf5#
      • 1...Qe5
        • 2.Rxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • K(d);N_SPINP(g),S_FLIGHT::S(M)
    • Q(c);OGATE,XS(J)::R1(G),XQ(c)
    • Q(c);SBLOCK,XR(G)::S(M)
  • Tries
    • Try
      • S(J);XP(g)
      • Threat
        • QAR1(C),XQ(c)
      • Vars
        • K(d);P-FLIGHT,P_SPINQ(c),XP(I)::R(N),XP(e)
        • Q(c);N_GUARD,XQ(C)::R1(G)
        • Q(c);SBLOCK,XR(G)::S(M)
        • Q(c);N_GUARD::QAR2(C)
        • Q(c);N_GUARD::R1(G),XQ(c)
      • Refutation
        • K(d);S_FLIGHT,XR(G)
    • Try
      • S(J);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);XP(F)::B(L),XP(g)
        • Q(c);N_GUARD,XP(I)::QAR2(C)
        • Q(c);XP(K)::S(J),XQ(c)
        • Q(c);SBLOCK,XR(G)::S(M)
        • R(h);N_SPINP(g),P_PINP(H),XB(L)::QAR1(C),XQ(c)
        • B(i);XP(I)::B(L),XP(g)
        • Q(c);N_GUARD::R1(G),XQ(c)
        • R(h);::QAR1(C),XQ(c)
      • Refutation
        • K(d);S_FLIGHT,XR(G)
    • Try
      • S(M);CHECK
      • Refutation
        • K(d);S_FLIGHT,XR(G)
    • Try
      • B(L);CHECK,XP(g)
      • Vars
        • K(d);P-FLIGHT,P_SPINQ(c),XP(I)::QAB1(C),XQ(c)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • R(G);CHECK,XQ(c)
      • Vars
        • K(d);N_SPINP(g),S_FLIGHT::S(M)
      • Refutation
        • K(d);N_SPINP(g),P-FLIGHT,XP(I)
  • Actual
    • S(J);
    • Threat
      • QAR1(C),XQ(c)
    • Vars
      • K(d);OGATEB,S_FLIGHT,XR(G)::QAB1(C)
      • K(d);N_SPINP(g),P-FLIGHT,P_SPINQ(c),XP(I)::R(N),XP(e)
      • Q(c);N_GUARD,XQ(C)::R1(G)
      • Q(c);XP(F)::B(L),XP(g)
      • Q(c);N_GUARD,SBLOCK,XP(I)::QAR2(C)
      • Q(c);XP(K)::S(J),XQ(c)
      • Q(c);SBLOCK,XR(G)::S(M)
      • B(i);SBLOCK,XP(I)::B(L),XP(g)
      • Q(c);N_GUARD::QAR2(C)
      • Q(c);N_GUARD::R1(G),XQ(c)
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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).