MESON Chess Problem Database

Problem Display
PID: 33193 (3kBB2/b7/2Q2n2/5K2/8/8/8/8 w - - 0 1)

Paboucek, Frantisek

L'Aube, 1947

3kBB2/b7/2Q2n2/5K2/8/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.Qd7#
    • 1...Sg4
      • 2.Qd7#
    • 1...Sd5
      • 2.Qd7#
    • 1...Sh5
      • 2.Qd7#
    • 1...Sd7
      • 2.Qxd7#
    • 1...Sh7
      • 2.Qd7#
    • 1...Sg8
      • 2.Qd7#
  • Tries
    • 1.Ke6?
      • threat
        • 2.Be7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sd5
        • 2.Qd7#
      • 1...Sg8
        • 2.Qd7#
      • 1...Bc5!
    • 1.Kxf6?
      • threat
        • 2.Be7#
        • 2.Qd7#
      • 1...Bc5
        • 2.Qd7#
      • 1...Bd4+!
    • 1.Qa8+?
      • 1...Bb8
        • 2.Qxb8#
      • 1...Kc7!
    • 1.Qd6+?
      • 1...Kxe8
        • 2.Qe7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Kc8!
    • 1.Qc7+?
      • 1...Kxe8
        • 2.Qe7#
      • 1...Kxc7!
  • Keys
    • 1.Qb7!
      • 1...Kxe8
        • 2.Qe7#
      • 1...Sxe8
        • 2.Be7#
      • 1...Bg1
        • 2.Qb8#
      • 1...Bf2
        • 2.Qb8#
      • 1...Be3
        • 2.Qb8#
      • 1...Bd4
        • 2.Qb8#
      • 1...Bc5
        • 2.Qb8#
      • 1...Bb6
        • 2.Qb8#
      • 1...Bb8
        • 2.Qxb8#
      • 1...Se4
        • 2.Qd7#
      • 1...Sg4
        • 2.Qd7#
      • 1...Sd5
        • 2.Qd7#
      • 1...Sh5
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sh7
        • 2.Qd7#
      • 1...Sg8
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(B)
    • S(a);N_GUARD::QAR1(B),XS(a)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Threat
        • B(D)
      • Vars
        • S(a);N_GUARD::QAR1(B),XS(a)
        • S(a);N_GUARD::QAR1(B)
      • Refutation
        • B(b);
    • Try
      • K(A);P-FLIGHT,XS(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);::QAR1(B)
      • Refutation
        • B(b);CHECK
    • Try
      • Q(B);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR2(B),XB(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT,XB(C)::QAR1(B)
        • S(a);N_GUARD,P_SPINS(a)::QAR1(B),XS(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT,XB(C)::QAR1(B)
      • Refutation
        • K(c);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(c);P-FLIGHT,XB(C)::QAR1(B)
      • S(a);SBLOCK,XB(C)::B(D)
      • B(b);N_GUARD::QAR2(B)
      • B(b);N_GUARD::QAR2(B),XB(b)
      • S(a);N_GUARD::QAR1(B)
      • S(a);N_GUARD::QAR1(B),XS(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).