MESON Chess Problem Database

Problem Display
PID: 221439 (1k6/8/1B6/2NnK3/8/8/8/1Q6 w - - 0 1)

Nemo, Ottmar (Weiss, Ottmar)

Die Schwalbe, 1928

1k6/8/1B6/2NnK3/8/8/8/1Q6

#2

4 + 2

SOLUTION

  • SOUND
  • Tries
    • 1.Ba7+?
      • 1...Kxa7
        • 2.Qb7#
      • 1...Ka8
        • 2.Qb7#
        • 2.Qb8#
      • 1...Kc8
        • 2.Qb8#
      • 1...Kc7!
    • 1.Bc7+?
      • 1...Ka7
        • 2.Qa2#
        • 2.Qa1#
        • 2.Qb7#
        • 2.Qb8#
      • 1...Ka8
        • 2.Qa2#
        • 2.Qa1#
        • 2.Qb7#
        • 2.Qb8#
      • 1...Kc8
        • 2.Qb7#
        • 2.Qb8#
      • 1...Kxc7!
  • Keys
    • 1.Qh1!
      • threat
        • 2.Qh8#
      • 1...Ka8
        • 2.Qh8#
      • 1...Kc8
        • 2.Qh8#
      • 1...Sxb6
        • 2.Qb7#
      • 1...Sf6
        • 2.Qb7#
      • 1...Sc7
        • 2.Qb7#
      • 1...Se7
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • K(b);S_FLIGHT,XB(D)::QAR1(A)
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(D);CHECK
      • Refutation
        • K(b);S_FLIGHT,XB(D)
  • Actual
    • Q(A);
    • Threat
      • QAR(A)
    • Vars
      • K(b);P-FLIGHT,P_SPINS(a)::QAB1(A)
      • K(b);P-FLIGHT::QAR(A)
      • S(a);OGATE,XB(D)::QAR1(A)
      • S(a);OGATE::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).