MESON Chess Problem Database

Problem Display
PID: 79254 (5K2/8/8/4p3/1Qpk2N1/8/4R3/8 w - - 0 1)

Alekseev, Yuri Mikhailovich

Sahs, 1982

5K2/8/8/4p3/1Qpk2N1/8/4R3/8

#2

4 + 3

5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Qd2#
    • 1...e4
      • 2.Rd2#
  • Tries
    • 1.Kf7?
      • 1...Kd3
        • 2.Qd2#
      • 1...e4
        • 2.Rd2#
      • 1...Kd5!
    • 1.Kg7?
      • 1...Kd3
        • 2.Qd2#
      • 1...e4
        • 2.Rd2#
      • 1...Kd5!
    • 1.Ke8?
      • 1...Kd3
        • 2.Qd2#
      • 1...e4
        • 2.Rd2#
      • 1...Kd5!
    • 1.Kg8?
      • 1...Kd3
        • 2.Qd2#
      • 1...e4
        • 2.Rd2#
      • 1...Kd5!
    • 1.Sf6?
      • 1...Kd3
        • 2.Qd2#
      • 1...e4!
    • 1.Qa5?
      • 1...Kd3
        • 2.Qd2#
      • 1...e4
        • 2.Rd2#
      • 1...c3!
    • 1.Qb6+?
      • 1...Kd3
        • 2.Qe3#
      • 1...Kd5
        • 2.Sf6#
        • 2.Rxe5#
      • 1...Kc3!
  • Keys
    • 1.Ke7!
      • 1...Kd3
        • 2.Qd2#
      • 1...Kd5
        • 2.Qd6#
      • 1...e4
        • 2.Rd2#

Anticipated by 216696(1975)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(a),P-FLIGHT::QAR1(B)
    • P(c);SBLOCK::R(A)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR1(B)
        • P(c);SBLOCK::R(A)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT
    • Try
      • K(D);S_FLIGHT
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR1(B)
        • P(c);SBLOCK::R(A)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR1(B)
        • P(c);SBLOCK::R(A)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR1(B)
        • P(c);SBLOCK::R(A)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT
    • Try
      • S(C);
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR1(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);N_PINP(a)
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
        • P(c);SBLOCK::R(A)
      • Refutation
        • P(a);
    • Try
      • Q(B);CHECK,N_PINP(a)
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • K(D);S_FLIGHT
    • Vars
      • K(b);N_SPINP(a),P-FLIGHT::QAR1(B)
      • P(c);SBLOCK::R(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).