MESON Chess Problem Database

Problem Display
PID: 140156 (8/3BB3/7n/1R1bk3/4p2P/3p4/1K6/4QN2 w - - 0 1)

Bollen, HJLS

Probleemblad, 1975

8/3BB3/7n/1R1bk3/4p2P/3p4/1K6/4QN2

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qc3#
    • 1...Kf4
      • 2.Qg3#
    • 1...e3
      • 2.Qxe3#
  • Tries
    • 1.Kc3?
      • threat
        • 2.Qg3#
      • 1...Kf4
        • 2.Qg3#
      • 1...e3
        • 2.Qxe3#
      • 1...Sf5!
    • 1.Rxd5+?
      • 1...Kf4
        • 2.Qf2#
        • 2.Qg3#
        • 2.Qe3#
      • 1...Kxd5!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Qxe4#
      • 1...Kd4
        • 2.Bf6#
      • 1...Kf4
        • 2.Bd6#
      • 1...e3
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINB(c),N_SPINP(b),S_FLIGHT::QAB1(A)
    • P(b);OGATEB::QAR2(A),XP(b)
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Threat
        • QAB(A)
      • Vars
        • K(d);N_SPINB(c),N_SPINP(b),S_FLIGHT::QAB1(A)
        • P(b);OGATEB::QAR2(A),XP(b)
      • Refutation
        • S(e);
    • Try
      • R(E);CHECK,XB(c)
      • Refutation
        • K(d);N_SPINP(b),P-FLIGHT,XR(E)
  • Actual
    • S(B);
    • Threat
      • QAR1(A),XP(b)
    • Vars
      • K(d);N_SPINB(c),N_SPINP(b),S_FLIGHT::B(G)
      • P(b);OGATEB::QAR2(A),XP(b)
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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).