MESON Chess Problem Database

Problem Display
PID: 227704 (8/8/8/1p6/kP6/p1P5/1pK5/1Q6 w - - 0 1)

Beck, Gyula

Nepszava, 1926

8/8/8/1p6/kP6/p1P5/1pK5/1Q6

#2

4 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...a2
      • 2.Qxa2#
  • Tries
    • 1.Kd1?
      • threat
        • 2.Qc2#
      • 1...a2
        • 2.Qxa2#
      • 1...Kb3!
    • 1.Kd2?
      • threat
        • 2.Qc2#
        • 2.Qd1#
      • 1...a2
        • 2.Qxa2#
      • 1...Kb3!
    • 1.Kd3?
      • threat
        • 2.Qc2#
        • 2.Qd1#
      • 1...a2
        • 2.Qxa2#
      • 1...Kb3!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Kb1#
        • 2.Kd2#
        • 2.Kd3#
      • 1...b1Q+
        • 2.Kxb1#
      • 1...b1B+
        • 2.Kxb1#
      • 1...a2
        • 2.Kxb2#
      • 1...b1S
        • 2.Kxb1#
        • 2.Kc1#
        • 2.Kd3#
      • 1...b1R
        • 2.Kxb1#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB::QAR2(A),XP(b)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAB(A)
      • Vars
        • P(b);OGATEB::QAR2(A),XP(b)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
    • Try
      • K(B);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • P(b);OGATEB::QAR2(A),XP(b)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
    • Try
      • K(B);S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • P(b);OGATEB::QAR2(A),XP(b)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • DUALS(3)
    • Vars
      • P(a);CHECK::QAB(A)+K(B),XQ(a)
      • P(a);CHECK::QAB(A)+K(B),XB(a)
      • P(b);::QAB(A)+K(B),XP(a)
      • P(a);::QAB(A)+K(B),XR(a)
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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).