MESON Chess Problem Database

Problem Display
PID: 4706 (6nN/1Q6/3pk2n/4p2N/7P/3B4/8/5K2 w - - 0 1)

Pospisil, Josef

Bahn Frei, 1888-1890

6nN/1Q6/3pk2n/4p2N/7P/3B4/8/5K2

#2

6 + 5

3804 Ceske Melodie 1908
3360 Simple Two-move Themes 1924
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Sg4
      • 2.Qf7#
    • 1...Sf5
      • 2.Qf7#
    • 1...Sf7
      • 2.Qxf7#
    • 1...Sf6
      • 2.Sg7#
  • Tries
    • 1.Bc4+?
      • 1...Kf5
        • 2.Qf3#
      • 1...d5!
    • 1.Bf5+?
      • 1...Sxf5
        • 2.Qf7#
      • 1...Kxf5!
    • 1.Qc8+?
      • 1...Kd5
        • 2.Qc4#
      • 1...Ke7!
  • Keys
    • 1.Bb5!
      • 1...Kf5
        • 2.Bd7#
      • 1...e4
        • 2.Qxe4#
      • 1...d5
        • 2.Qd7#
      • 1...Sg4
        • 2.Qf7#
      • 1...Sf5
        • 2.Qf7#
      • 1...Sf7
        • 2.Qxf7#
      • 1...Sf6
        • 2.Sg7#
      • 1...Se7
        • 2.Bd7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD::QAB1(E)
    • S(d);N_GUARD::QAB1(E),XS(d)
    • S(e);SBLOCK::S(D)
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR2(E)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • B(B);CHECK
      • Vars
        • S(d);XB(B)::QAB1(E)
      • Refutation
        • K(c);S_FLIGHT,XB(B)
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(E)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • B(B);
    • Vars
      • K(c);S_FLIGHT::B(B)
      • P(a);OGATEB::QAR2(E),XP(a)
      • P(b);::QAB1(E)
      • S(d);N_GUARD::QAB1(E)
      • S(d);N_GUARD::QAB1(E),XS(d)
      • S(e);SBLOCK::S(D)
      • S(e);SBLOCK::B(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).