MESON Chess Problem Database

Problem Display
PID: 16869 (K5N1/8/4p3/4k3/1P3r2/1N6/2Q4B/3R4 w - - 0 1)

Valve, Leo Erland

Aseveli, 1944

K5N1/8/4p3/4k3/1P3r2/1N6/2Q4B/3R4

#2

7 + 3

SOLUTION

  • SOUND
  • Tries
    • 1.Sd4?
      • threat
        • 2.Sf3#
        • 2.Sc6#
      • 1...Kd6
        • 2.Sf3#
      • 1...Kd5!
    • 1.Re1+?
      • 1...Kd5
        • 2.Qc5#
      • 1...Kd6!
    • 1.Qc1?
      • threat
        • 2.Qxf4#
      • 1...Ke4
        • 2.Qxf4#
      • 1...Kf5!
    • 1.Qd2?
      • threat
        • 2.Qxf4#
      • 1...Ke4
        • 2.Qxf4#
      • 1...Kf5!
    • 1.Qf2?
      • threat
        • 2.Qxf4#
      • 1...Ke4
        • 2.Qxf4#
      • 1...Kf5!
    • 1.Qc7+?
      • 1...Ke4
        • 2.Qxf4#
      • 1...Kf5!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Sf3#
        • 2.Sc4#
        • 2.Qc5#
      • 1...Kd4
        • 2.Sc4#
      • 1...Kd5
        • 2.Qc5#
      • 1...Kd6
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);S_FLIGHT::R(A)+S(D)
      • Refutation
        • K(b);N_SPINR(a),P-FLIGHT
    • Try
      • R(A);CHECK
      • Vars
        • K(b);N_SPINR(a),P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B),XR(a)
      • Vars
        • K(b);N_SPINR(a),P-FLIGHT::QAR1(B),XR(a)
      • Refutation
        • K(b);N_SPINR(a),P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B),XR(a)
      • Vars
        • K(b);N_SPINR(a),P-FLIGHT::QAR1(B),XR(a)
      • Refutation
        • K(b);N_SPINR(a),P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B),XR(a)
      • Vars
        • K(b);N_SPINR(a),P-FLIGHT::QAR1(B),XR(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);N_SPINR(a),OGATE,P-FLIGHT::QAR1(B),XR(a)
      • Refutation
        • K(b);N_SPINR(a),P-FLIGHT
  • Actual
    • S(D);
    • Threat
      • DUALS(3)
    • Vars
      • K(b);N_SPINR(a),S_FLIGHT::R(A)+S(D)
      • K(b);N_SPINR(a),P-FLIGHT::QAR1(B)
      • K(b);S_FLIGHT::R(A)+S(D)
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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).