Problem Display
PID: 85714 (8/4pK2/8/5k1p/8/4B3/4B3/Q7 w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1986

8/4pK2/8/5k1p/8/4B3/4B3/Q7

#2

4 + 3


6490 yacpdb 2009

SOLUTION


  • SOUND
  • Tries
    • 1.Bf4?
      • threat
        • 2.Qe5#
      • 1...Ke4
        • 2.Qe5#
      • 1...e5
        • 2.Qxe5#
      • 1...Kxf4!
    • 1.Qf6+?
      • 1...Ke4
        • 2.Qe6#
      • 1...exf6!
    • 1.Qg7?
      • threat
        • 2.Bd3#
      • 1...e5
        • 2.Qg6#
        • 2.Qh7#
      • 1...Ke4!
    • 1.Qa2?
      • threat
        • 2.Qe6#
      • 1...Ke4
        • 2.Qe6#
      • 1...Ke5
        • 2.Qe6#
      • 1...e6
        • 2.Qxe6#
      • 1...e5!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Qe6#
      • 1...Ke4
        • 2.Qe6#
      • 1...Ke5
        • 2.Qe6#
      • 1...e5
        • 2.Qg6#
      • 1...e6
        • 2.Qxe6#

There are these versions: 232403, 232405

FEATURES


  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(C);
      • Threat
        • QAR1(A)
      • Vars
        • K(a);S_FLIGHT::QAR1(A)
        • P(c);::QAR1(A),XP(c)
      • Refutation
        • K(a);P-FLIGHT,XB(C)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • P(c);XQ(A)
    • Try
      • Q(A);
      • Threat
        • B(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
        • K(a);P-FLIGHT::QAR1(A)
        • P(c);::QAB1(A),XP(c)
      • Refutation
        • P(c);
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(a);S_FLIGHT::QAR2(A)
      • K(a);P-FLIGHT::QAR1(A)
      • P(c);SBLOCK::QAB1(A)
      • P(c);::QAB1(A),XP(c)


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).