MESON Chess Problem Database

Problem Display
PID: 220224 (8/8/8/7Q/4K3/5N2/4kpnR/8 w - - 0 1)

Torngren, Pehr Hendrik

Die Schwalbe, 1928

8/8/8/7Q/4K3/5N2/4kpnR/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kf1
      • 2.Qb5#
  • Tries
    • 1.Sd4+?
      • 1...Ke1
        • 2.Qe2#
      • 1...Kf1
        • 2.Rh1#
      • 1...Kd2!
  • Keys
    • 1.Qa5!
      • 1...Kd1
        • 2.Qd2#
      • 1...Kf1
        • 2.Qb5#
        • 2.Qa6#
      • 1...f1Q
        • 2.Qd2#
      • 1...f1S
        • 2.Qe1#
      • 1...f1B
        • 2.Qe1#
        • 2.Qd2#
      • 1...f1R
        • 2.Qd2#
      • 1...Se1
        • 2.Qxe1#
      • 1...Se3
        • 2.Qe1#
      • 1...Sf4
        • 2.Qe1#
      • 1...Sh4
        • 2.Qe1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • K(a);S_FLIGHT::QAB(D)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(D)
        • K(a);S_FLIGHT::R(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(D);
    • Vars
      • K(a);S_FLIGHT::QAR1(D)
      • P(b);P_SPINS(c),SBLOCK::QAR1(D)
      • P(b);N_GUARD,P_SPINS(c)::QAR1(D)
      • S(c);N_GUARD,P_SPINP(b)::QAR1(D),XS(c)
      • S(c);N_GUARD,P_SPINP(b)::QAR1(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).