MESON Chess Problem Database

Problem Display
PID: 77259 (QK6/2N5/pkp5/8/8/3R4/8/8 w - - 0 1)

Abramenko, Sergey Petrovich

Koster, 1984

QK6/2N5/pkp5/8/8/3R4/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...a5
      • 2.Qa7#
    • 1...c5
      • 2.Qxa6#
  • Tries
    • 1.Ra3?
      • threat
        • 2.Qa7#
      • 1...c5
        • 2.Rxa6#
        • 2.Qb7#
        • 2.Qxa6#
      • 1...Kc5!
    • 1.Rb3+?
      • 1...Ka5
        • 2.Qxa6#
      • 1...Kc5!
    • 1.Rc3?
      • threat
        • 2.Qxa6#
      • 1...a5
        • 2.Rxc6#
        • 2.Qxc6#
        • 2.Qb7#
        • 2.Qa6#
        • 2.Qa7#
      • 1...Ka5!
    • 1.Rd5?
      • threat
        • 2.Qb7#
        • 2.Qxa6#
        • 2.Qa7#
      • 1...c5
        • 2.Qxa6#
      • 1...a5
        • 2.Qb7#
        • 2.Qxa5#
        • 2.Qa6#
        • 2.Qa7#
      • 1...cxd5!
    • 1.Qb7+?
      • 1...Ka5
        • 2.Ra3#
      • 1...Kc5!
  • Keys
    • 1.Rd4!
      • 1...Ka5
        • 2.Qxa6#
      • 1...Kc5
        • 2.Qa7#
      • 1...a5
        • 2.Qa7#
      • 1...c5
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);::QAB1(C)
    • P(c);SBLOCK::QAR1(C),XP(a)
  • Tries
    • Try
      • R(A);
      • Threat
        • QAB1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(A);CHECK
      • Vars
        • K(b);P_SPINP(a),S_FLIGHT::QAR1(C),XP(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(A);
      • Threat
        • QAR1(C),XP(a)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
    • Try
      • R(A);
      • Threat
        • DUALS(3)
      • Vars
        • P(c);::QAR1(C),XP(a)
      • Refutation
        • P(c);XR(A)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);S_FLIGHT::R(A)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(A);
    • Vars
      • K(b);P_SPINP(a),S_FLIGHT::QAR1(C),XP(a)
      • K(b);S_FLIGHT::QAB(C)
      • P(a);::QAB1(C)
      • P(c);SBLOCK::QAR1(C),XP(a)
HTML5 logo

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).