MESON Chess Problem Database

Problem Display
PID: 142422 (n2k2B1/6pR/1PK1Q2q/3N2p1/7p/3R3r/8/7b w - - 0 1)

Melvin, Herbert A ('Hamel' or Zaak, HA)

McClure Problem Folder, 1945

n2k2B1/6pR/1PK1Q2q/3N2p1/7p/3R3r/8/7b

#2

7 + 8

14867 BCPS Library 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Qh5
      • 2.Qd7#
    • 1...Qxh7
      • 2.Qd7#
    • 1...Rf3
      • 2.Se3#
    • 1...Bxd5+
      • 2.Rxd5#
    • 1...Sc7
      • 2.bxc7#
    • 1...g6
      • 2.Qd7#
  • Tries
    • 1.Kb7?
      • threat
        • 2.Qc8#
        • 2.Qe7#
      • 1...Bxd5+
        • 2.Rxd5#
      • 1...Sxb6
        • 2.Qe7#
      • 1...Qf6
        • 2.Qc8#
      • 1...Re3
        • 2.Qc8#
      • 1...Qxe6!
    • 1.Rxh6?
      • threat
        • 2.Qd7#
      • 1...Bxd5+
        • 2.Rxd5#
      • 1...Sxb6!
  • Keys
    • 1.Rh8!
      • threat
        • 2.Bh7#
      • 1...Qxe6+
        • 2.Bxe6#
      • 1...Bxd5+
        • 2.Rxd5#
      • 1...Qxh8
        • 2.Qd7#
      • 1...Qh5
        • 2.Qd7#
      • 1...Qf6
        • 2.Bf7#
      • 1...Qg6
        • 2.Bf7#
      • 1...Qh7
        • 2.Bxh7#
        • 2.Qd7#
      • 1...Rf3
        • 2.Se3#
      • 1...Sc7
        • 2.bxc7#
      • 1...g6
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(e);N_PINQ(E)::QAR1(E)
    • Q(e);N_PINQ(E),XR(F)::QAR1(E)
    • R(b);N_PINS(B)::R(A)+S(B)
    • B(a);CHECK,OGATE,P_SPINB(a),XS(B)::R(A),XB(a)
    • S(g);OGATE::P(C),XS(g)
    • P(f);N_PINQ(E)::QAR1(E)
  • Tries
    • Try
      • K(D);N_SPINQ(E),S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,OGATE,P_SPINB(a),XS(B)::R(A),XB(a)
        • S(g);XP(C)::QAB1(E)
        • Q(e);::QAR1(E)
        • R(b);::QAR1(E)
      • Refutation
        • Q(e);XQ(E)
    • Try
      • R(F);N_SPINQ(E),XQ(e)
      • Threat
        • QAR1(E)
      • Vars
        • B(a);CHECK,OGATE,P_SPINB(a),XS(B)::R(A),XB(a)
      • Refutation
        • S(g);XP(C)
  • Actual
    • R(F);
    • Threat
      • R(F)+B(G)
    • Vars
      • Q(e);CHECK,OGATE,XQ(E)::R(F)+B(G),XQ(e)
      • B(a);CHECK,OGATE,P_SPINB(a),XS(B)::R(A),XB(a)
      • Q(e);N_PINQ(E),XR(F)::QAR1(E)
      • Q(e);N_PINQ(E)::QAR1(E)
      • Q(e);N_GUARD::R(F)+B(G)
      • R(b);N_PINS(B)::R(A)+S(B)
      • S(g);OGATE::P(C),XS(g)
      • P(f);N_PINQ(E)::QAR1(E)
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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).