MESON Chess Problem Database

Problem Display
PID: 183153 (3b4/1nB5/8/8/k1B2n2/2Q5/2b4K/8 w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

Bohemia, 1907

3b4/1nB5/8/8/k1B2n2/2Q5/2b4K/8

#2

4 + 5

6490 yacpdb 2018
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bb1
      • 2.Qb3#
    • 1...Bb3
      • 2.Qxb3#
    • 1...Bd3
      • 2.Qb3#
    • 1...Be4
      • 2.Qb3#
    • 1...Bf5
      • 2.Qb3#
    • 1...Bg6
      • 2.Qb3#
    • 1...Bh7
      • 2.Qb3#
    • 1...Sa5
      • 2.Qxa5#
    • 1...Sc5
      • 2.Qa5#
    • 1...Sd6
      • 2.Qa5#
  • Tries
    • 1.Bd5?
      • threat
        • 2.Bc6#
      • 1...Kb5
        • 2.Qc4#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bd3
        • 2.Qb3#
      • 1...Be4
        • 2.Qb3#
      • 1...Sa5
        • 2.Qxa5#
      • 1...Sd6
        • 2.Qa5#
      • 1...Sxd5!
    • 1.Be6?
      • threat
        • 2.Bd7#
      • 1...Kb5
        • 2.Qc4#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bd3
        • 2.Qb3#
      • 1...Be4
        • 2.Qb3#
      • 1...Bf5
        • 2.Qb3#
      • 1...Sa5
        • 2.Qxa5#
      • 1...Sc5
        • 2.Qa5#
      • 1...Sd6
        • 2.Qa5#
      • 1...Sxe6!
    • 1.Qxc2+?
      • 1...Ka3
        • 2.Qb3#
      • 1...Kb4!
  • Keys
    • 1.Bf7!
      • threat
        • 2.Be8#
      • 1...Kb5
        • 2.Qc4#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bd3
        • 2.Qb3#
      • 1...Be4
        • 2.Qb3#
      • 1...Bf5
        • 2.Qb3#
      • 1...Bg6
        • 2.Qb3#
      • 1...Sa5
        • 2.Qxa5#
      • 1...Sc5
        • 2.Qa5#
      • 1...Sd6
        • 2.Qa5#

This anticipates 20985(1915)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::QAB1(B)
    • B(a);N_GUARD::QAB1(B),XB(a)
    • S(d);N_GUARD::QAR1(B),XS(d)
    • S(d);N_GUARD::QAR1(B)
  • Tries
    • Try
      • B(C);
      • Threat
        • B(C)
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • B(a);N_GUARD::QAB1(B),XB(a)
        • B(a);N_GUARD::QAB1(B)
        • S(d);N_GUARD::QAR1(B),XS(d)
        • S(d);N_GUARD::QAR1(B)
      • Refutation
        • S(c);XB(C)
    • Try
      • B(C);
      • Threat
        • B(C)
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • B(a);N_GUARD::QAB1(B),XB(a)
        • B(a);N_GUARD::QAB1(B)
        • S(d);N_GUARD::QAR1(B),XS(d)
        • S(d);N_GUARD::QAR1(B)
      • Refutation
        • S(c);XB(C)
    • Try
      • Q(B);CHECK,XB(a)
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • B(C);
    • Threat
      • B(C)
    • Vars
      • K(b);S_FLIGHT::QAB1(B)
      • B(a);N_GUARD::QAB1(B),XB(a)
      • B(a);N_GUARD::QAB1(B)
      • S(d);N_GUARD::QAR1(B),XS(d)
      • S(d);N_GUARD::QAR1(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).