MESON Chess Problem Database

Problem Display
PID: 10911 (8/5pPK/Npp2pQ1/5rp1/P1k1P3/1p6/1Bb2N2/2R5 w - - 0 1)

Ellison, Wallace D

The Problemist, 1969

8/5pPK/Npp2pQ1/5rp1/P1k1P3/1p6/1Bb2N2/2R5

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rf3
      • 2.Qxf7#
    • 1...Rf4
      • 2.Qxf7#
  • Tries
    • 1.Qxf5?
      • 1...b5
        • 2.Qc5#
      • 1...c5
        • 2.Qd5#
      • 1...g4!
    • 1.exf5?
      • threat
        • 2.Qxf7#
      • 1...fxg6
        • 2.g8Q#
        • 2.g8B#
      • 1...Kd5!
  • Keys
    • 1.e5!
      • threat
        • 2.Qxf7#
      • 1...Kd5
        • 2.Qxf7#
      • 1...Rxf2
        • 2.Qe4#
      • 1...Rxe5
        • 2.Qd3#
      • 1...fxe5
        • 2.Qxc6#
      • 1...fxg6
        • 2.g8Q#
        • 2.g8B#
      • 1...Rf3
        • 2.Qe4#
      • 1...Rf4
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(d);N_GUARD::QAB(G),XP(i)
  • Tries
    • Try
      • Q(G);XR(d)
      • Vars
        • P(f);N_GUARD::QAR1(G)
        • P(g);N_GUARD::QAB1(G)
      • Refutation
        • P(e);
    • Try
      • P(E);XR(d)
      • Threat
        • QAB(G),XP(i)
      • Vars
        • P(i);XQ(G)::P=Q
      • Refutation
        • K(c);N_SPINB(a),S_FLIGHT
  • Actual
    • P(E);
    • Threat
      • QAB(G),XP(i)
    • Vars
      • K(c);N_SPINB(a),S_FLIGHT::QAB(G),XP(i)
      • R(d);OGATE,P_PINQ(G),XS(C)::QAR2(G)
      • R(d);OGATE,P_PINQ(G),XP(E)::QAB1(G)
      • P(h);OGATE,XP(E)::QAR2(G),XP(g)
      • P(i);XQ(G)::P=Q
      • R(d);OGATE,P_PINQ(G)::QAR2(G)
      • R(d);OGATE,P_PINQ(G)::QAB1(G)
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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).