Problem Display
PID: 258639 (8/2K5/3p4/1pk5/2P5/2Q5/8/2R5 w - - 0 1)

Velikhanov, Kenan

64 Shakhmatnoe obozrenie, 2022

8/2K5/3p4/1pk5/2P5/2Q5/8/2R5

#2

4 + 3


SOLUTION


  • SOUND
  • Sets
    • 1...bxc4
      • 2.Qxc4#
    • 1...b4
      • 2.Qe3#
  • Tries
    • 1.Kb7?
      • 1...bxc4
        • 2.Qxc4#
      • 1...b4
        • 2.Qe3#
      • 1...d5!
    • 1.Ra1?
      • 1...bxc4
        • 2.Ra5#
      • 1...b4
        • 2.Ra5#
      • 1...d5!
    • 1.Rc2?
      • 1...bxc4
        • 2.Qxc4#
      • 1...b4
        • 2.Qe3#
      • 1...d5!
    • 1.Qb2?
      • 1...b4
        • 2.Qf2#
      • 1...d5
        • 2.cxb5#
      • 1...bxc4!
    • 1.Qd2?
      • threat
        • 2.Qxd6#
      • 1...d5
        • 2.cxd5#
      • 1...bxc4!
    • 1.Qa3+?
      • 1...b4
        • 2.Qe3#
        • 2.Qa7#
      • 1...Kd4!
  • Keys
    • 1.Rd1!
      • threat
        • 2.Rd5#
      • 1...bxc4
        • 2.Qa5#
      • 1...d5
        • 2.Rxd5#
        • 2.cxd5#

FEATURES


  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • P(a);OGATE,P_SPINP(a),XP(C)::QAR1(B),XP(a)
    • P(a);SBLOCK::QAB(B)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • P(a);OGATE,P_SPINP(a),XP(C)::QAR1(B),XP(a)
        • P(a);SBLOCK::QAB(B)
      • Refutation
        • P(c);
    • Try
      • R(A);
      • Vars
        • P(a);OGATEB,P_SPINP(a),XP(C)::R(A)
        • P(a);OGATEB::R(A)
      • Refutation
        • P(c);
    • Try
      • R(A);
      • Vars
        • P(a);OGATE,P_SPINP(a),XP(C)::QAR1(B),XP(a)
        • P(a);SBLOCK::QAB(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Vars
        • P(a);SBLOCK::QAB(B)
        • P(c);SBLOCK::R(A)+P(C),XP(a)
      • Refutation
        • P(a);P_SPINP(a),XP(C)
    • Try
      • Q(B);
      • Threat
        • QAB1(B),XP(c)
      • Vars
        • P(c);OGATE::R(A)+P(C),XP(c)
      • Refutation
        • P(a);P_SPINP(a),XP(C)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(A);
    • Threat
      • R1(A)
    • Vars
      • P(a);OGATEB,P_SPINP(a),SBLOCK,XP(C)::QAR2(B)


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).