MESON Chess Problem Database

Problem Display
PID: 206355 (8/2pB3K/2P1p3/R2bk1BQ/8/8/2PN4/8 w - - 0 1)

Wahlmark, Carl Primus

Hvar a Dag, 1925

8/2pB3K/2P1p3/R2bk1BQ/8/8/2PN4/8

#2

8 + 4

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Rxd5#
  • Tries
    • 1.Be3+?
      • 1...Kd6
        • 2.Bc5#
      • 1...Kf6!
    • 1.Bf6+?
      • 1...Kf4
        • 2.Qg5#
      • 1...Kd6
        • 2.Qe5#
      • 1...Kxf6!
    • 1.Be7+?
      • 1...Kf4
        • 2.Qg5#
      • 1...Kd4!
    • 1.Qe2+?
      • 1...Kd4
        • 2.Qe3#
      • 1...Kf5
        • 2.Rxd5#
      • 1...Kd6!
    • 1.Qf3?
      • threat
        • 2.Qf4#
      • 1...Kd4
        • 2.Qe3#
      • 1...Kd6!
    • 1.Qh2+?
      • 1...Kf5
        • 2.Qf4#
      • 1...Kd4!
    • 1.Qh3?
      • 1...Kd4
        • 2.Qe3#
      • 1...Kd6!
    • 1.Qh4?
      • threat
        • 2.Qf4#
      • 1...Kf5
        • 2.Rxd5#
        • 2.Qf4#
      • 1...Kd6!
    • 1.c3?
      • 1...Kf5
        • 2.Rxd5#
      • 1...Kd6!
  • Keys
    • 1.Qd1!
      • 1...Kd4
        • 2.Qa1#
      • 1...Kf5
        • 2.Rxd5#
      • 1...Kd6
        • 2.Sc4#

This anticipates 66889(1947)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT,P_SPINP(c)::R(C),XB(a)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT::B(D)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT,XB(D)
    • Try
      • B(D);CHECK
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT::QAB1(E)
        • K(b);P-FLIGHT,P_SPINP(c)::R(C),XB(a)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::QAR1(E)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • P(A);
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::R(C),XB(a)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(b);N_SPINB(a),S_FLIGHT::QAB(E)
      • K(b);P-FLIGHT,P_SPINP(c)::R(C),XB(a)
      • K(b);N_SPINB(a),S_FLIGHT::S(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).