MESON Chess Problem Database

Problem Display
PID: 228849 (4R3/N2p1B2/4n1K1/2rk4/8/B2n1N2/P2R2P1/7Q w - - 0 1)

Lehn, Paul

Arbeiter Schachzeitung, 1926

4R3/N2p1B2/4n1K1/2rk4/8/B2n1N2/P2R2P1/7Q

#2

10 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Qa1?
      • threat
        • 2.Qd4#
      • 1...Kc4
        • 2.Qd4#
      • 1...Ke4
        • 2.Qd4#
      • 1...Kd6
        • 2.Qe5#
      • 1...Rc4
        • 2.Qe5#
      • 1...Rc3!
    • 1.Qh5+?
      • 1...Kc4
        • 2.Rc2#
      • 1...Kd6
        • 2.Qe5#
      • 1...Ke4!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qd4#
      • 1...Kc4
        • 2.Qd4#
      • 1...Ke4
        • 2.Qd4#
      • 1...Kd6
        • 2.Qe5#
      • 1...Rc4
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(c);N_SPINS(a),P_SPINS(d),S_FLIGHT::QAR1(A)
        • K(c);P-FLIGHT,P_SPINR(b)::QAB1(A)
        • R(b);SBLOCK::QAR1(A)
      • Refutation
        • R(b);
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);N_SPINS(a),P_SPINS(d),S_FLIGHT::R(C)
        • K(c);P-FLIGHT,P_SPINR(b)::QAB1(A)
      • Refutation
        • K(c);N_SPINS(a),P_SPINS(d),S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(c);N_SPINS(a),P_SPINS(d),S_FLIGHT::QAR1(A)
      • K(c);P-FLIGHT,P_SPINR(b)::QAB1(A)
      • R(b);SBLOCK::QAR1(A)
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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).