MESON Chess Problem Database

Problem Display
PID: 141405 (1b5Q/4RP2/3NBKP1/8/pP1k2q1/7p/1nPP1Rp1/3n2N1 w - - 0 1)

Markwick, Frederick W

Source?, 1882

1b5Q/4RP2/3NBKP1/8/pP1k2q1/7p/1nPP1Rp1/3n2N1

#2

12 + 8

14867 BCPS Library 2011
3713 Snap 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.Sxe2#
    • 1...Qf3+
      • 2.Sxf3#
    • 1...Qf5+
      • 2.Kxf5#
    • 1...Qh5
      • 2.Rf4#
    • 1...Qxe6+
      • 2.Kxe6#
    • 1...Qg3
      • 2.Se2#
    • 1...Qe4
      • 2.Sb5#
    • 1...Qf4+
      • 2.Rxf4#
    • 1...Qh4+
      • 2.Qxh4#
    • 1...Qg5+
      • 2.Kxg5#
    • 1...Qxg6+
      • 2.Kxg6#
  • Tries
    • 1.Rf3?
      • threat
        • 2.Se2#
      • 1...Qxf3+
        • 2.Sxf3#
      • 1...Qf5+
        • 2.Kxf5#
      • 1...Qxe6+
        • 2.Kxe6#
      • 1...Qf4+
        • 2.Rxf4#
      • 1...Qh4+
        • 2.Qxh4#
      • 1...Qg5+
        • 2.Kxg5#
      • 1...Qxg6+
        • 2.Kxg6#
      • 1...Qe4
        • 2.Sb5#
      • 1...Sc3
        • 2.dxc3#
      • 1...Bxd6!
  • Keys
    • 1.Rc7!
      • threat
        • 2.Ke7#
      • 1...Qf3+
        • 2.Sxf3#
      • 1...Qf5+
        • 2.Kxf5#
      • 1...Qxe6+
        • 2.Kxe6#
      • 1...Qf4+
        • 2.Rxf4#
      • 1...Qh4+
        • 2.Qxh4#
      • 1...Qg5+
        • 2.Kxg5#
      • 1...Qxg6+
        • 2.Kxg6#
      • 1...Sd3
        • 2.Rc4#
      • 1...Qe2
        • 2.Sxe2#
      • 1...Qh5
        • 2.Rf4#
      • 1...Qg3
        • 2.Se2#
      • 1...Qe4
        • 2.Sb5#
      • 1...Sc4
        • 2.Rxc4#

This anticipates 146362(1918)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(g);N_GUARD::S(A),XQ(g)
    • Q(g);CHECK,N_GUARD::S(A),XQ(g)
    • Q(g);CHECK::QAB(L)+K(H),XQ(g)
    • Q(g);N_GUARD::R(D)
    • Q(g);CHECK,XB(G)::QAB(L)+K(H),XQ(g)
    • Q(g);N_GUARD::S(A)
    • Q(g);SBLOCK::S(F)
    • Q(g);CHECK,N_GUARD::R(D),XQ(g)
    • Q(g);CHECK,OGATEB::QAR(L),XQ(g)
    • Q(g);CHECK,XP(I)::QAB(L)+K(H),XQ(g)
  • Tries
    • Try
      • R(D);
      • Threat
        • S(A)
      • Vars
        • Q(g);CHECK,XR(D)::S(A),XQ(g)
        • Q(g);CHECK::QAB(L)+K(H),XQ(g)
        • Q(g);CHECK,XB(G)::QAB(L)+K(H),XQ(g)
        • Q(g);CHECK,N_GUARD::R(D),XQ(g)
        • Q(g);CHECK,OGATEB::QAR(L),XQ(g)
        • Q(g);CHECK,XP(I)::QAB(L)+K(H),XQ(g)
        • Q(g);SBLOCK::S(F)
        • S(a);OGATE::P(C),XS(a)
      • Refutation
        • B(h);XS(F)
  • Actual
    • R(J);
    • Threat
      • QAB(L)+K(H)
    • Vars
      • Q(g);CHECK,N_GUARD::S(A),XQ(g)
      • Q(g);CHECK::QAB(L)+K(H),XQ(g)
      • Q(g);CHECK,XB(G)::QAB(L)+K(H),XQ(g)
      • Q(g);CHECK,N_GUARD::R(D),XQ(g)
      • Q(g);CHECK,OGATEB::QAR(L),XQ(g)
      • Q(g);CHECK,XP(I)::QAB(L)+K(H),XQ(g)
      • S(b);N_GUARD::R1(J)
      • Q(g);N_GUARD::S(A),XQ(g)
      • Q(g);N_GUARD::R(D)
      • Q(g);N_GUARD::S(A)
      • Q(g);SBLOCK::S(F)
      • S(b);N_GUARD::R1(J),XS(b)
HTML5 logo

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).