MESON Chess Problem Database

Problem Display
PID: 51598 (2R4b/2q3B1/n3Q3/3BP1p1/rRPk1P2/P1p5/2P5/4KN2 w - - 0 1)

Ellerman, Arnoldo

The Guardian, 1968

2R4b/2q3B1/n3Q3/3BP1p1/rRPk1P2/P1p5/2P5/4KN2

#2

12 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qb6#
    • 1...Qxe5+
      • 2.Qxe5#
    • 1...Qxc4
      • 2.Rcxc4#
  • Tries
    • 1.Qh3?
      • threat
        • 2.Qe3#
      • 1...Kc5
        • 2.Qe3#
      • 1...Qxc4
        • 2.Qd3#
      • 1...gxf4!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qg1#
      • 1...Qxe5+
        • 2.fxe5#
      • 1...Kc5
        • 2.Qg1#
      • 1...Qxc4
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(c);P_SPINQ(f),S_FLIGHT::QAB1(J)
    • Q(f);CHECK,OGATE,P_SPINQ(f),XP(I)::QAB1(J),XQ(f)
    • Q(f);OGATE,P_SPINQ(f),XP(F)::R1(L),XQ(f)
  • Tries
    • Try
      • Q(J);
      • Threat
        • QAB1(J)
      • Vars
        • K(c);P_SPINQ(f),S_FLIGHT::QAB(J)
        • Q(f);P_SPINQ(f),XP(F)::QAR1(J)
      • Refutation
        • P(d);XP(G)
  • Actual
    • Q(J);
    • Threat
      • QAB(J)
    • Vars
      • Q(f);CHECK,OGATE,P_SPINQ(f),XP(I)::QAR(J)+P(G),XQ(f)
      • K(c);P_SPINQ(f),S_FLIGHT::QAB(J)
      • Q(f);P_SPINQ(f),XP(F)::QAR(J)
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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).