MESON Chess Problem Database

Problem Display
PID: 51557 (8/4Kp1N/2PB2p1/pQ2Nk2/r4p1R/4q3/3n2B1/3r4 w - - 0 1)

Beal, Edward W

The Guardian, 1964

8/4Kp1N/2PB2p1/pQ2Nk2/r4p1R/4q3/3n2B1/3r4

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Sxd3#
    • 1...Qg3
      • 2.Sd3#
      • 2.Sc4#
      • 2.Sg4#
      • 2.Sd7#
      • 2.Sxf7#
    • 1...Qh3
      • 2.Sd3#
      • 2.Sc4#
      • 2.Sg4#
      • 2.Sd7#
      • 2.Sxf7#
    • 1...Qe4
      • 2.Bh3#
    • 1...Qxe5+
      • 2.Qxe5#
  • Tries
    • 1.Rh5+?
      • 1...g5
        • 2.Rxg5#
      • 1...gxh5!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qxf7#
      • 1...Qa7+
        • 2.Sd7#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Qb3
        • 2.Sc4#
      • 1...Qf3
        • 2.Sxf3#
      • 1...Sf3
        • 2.Bh3#
      • 1...Se4
        • 2.Sd3#
      • 1...f6
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_PINS(D)::QAR(C)+S(D),XQ(c)
    • Q(c);N_GUARD,SBLOCK::B(A)
    • Q(c);CHECK,OGATE,P_SPINQ(c),XS(D)::QAR1(C),XQ(c)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • P(h);P_SPINP(h)::R1(B),XP(h)
      • Refutation
        • P(h);XR(B)
  • Actual
    • Q(C);
    • Threat
      • QAR2(C),XP(i)
    • Vars
      • Q(c);CHECK,N_PINS(D)::QAR(C)+S(D)
      • Q(c);CHECK,OGATE,P_SPINQ(c),XS(D)::QAR1(C),XQ(c)
      • Q(c);N_PINS(D)::QAR(C)+S(D)
      • Q(c);N_PINS(D)::QAR(C)+S(D),XQ(c)
      • S(b);S_CUTQ(c)::B(A)
      • S(b);N_PINS(D)::QAR(C)+S(D)
      • P(i);N_GUARD::QAB1(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).