MESON Chess Problem Database

Problem Display
PID: 227457 (8/8/Q3B2K/8/4N3/8/1pp5/1k6 w - - 0 1)

Schaffer, Hans

Das Ratsel, 1926

8/8/Q3B2K/8/4N3/8/1pp5/1k6

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc1
      • 2.Qf1#
  • Tries
    • 1.Ba2+?
      • 1...Kc1
        • 2.Qf1#
      • 1...Ka1!
    • 1.Qd3?
      • 1...Kc1
        • 2.Qf1#
      • 1...Ka1!
  • Keys
    • 1.Bf5!
      • 1...c1Q+
        • 2.Sd2#
      • 1...c1B+
        • 2.Sd2#
        • 2.Sg5#
      • 1...Kc1
        • 2.Qf1#
      • 1...c1S
        • 2.Sd2#
        • 2.Sc3#
      • 1...c1R
        • 2.Sd2#
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR(B)
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);P_PINP(c)
      • Vars
        • K(a);N_SPINP(c),P-FLIGHT::QAR(B)
      • Refutation
        • K(a);N_SPINP(c),P-FLIGHT
  • Actual
    • B(C);
    • Vars
      • P(c);CHECK,SBLOCK::B(C)+S(A),DCHECK
      • K(a);P-FLIGHT::QAR(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).