MESON Chess Problem Database

Problem Display
PID: 266203 (3K2b1/4p3/3k4/5Q2/1P6/8/6B1/8 w - - 0 1)

den Broeder, G

Schakend Nederland, 1978

3K2b1/4p3/3k4/5Q2/1P6/8/6B1/8

#2

4 + 3

5454 Near Snap 2022
3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bd5
      • 2.Qxd5#
    • 1...Be6
      • 2.Qf4#
      • 2.Qc5#
    • 1...Bh7
      • 2.Qd5#
    • 1...e5
      • 2.Qd7#
    • 1...e6
      • 2.Qc5#
  • Tries
    • 1.Qg5?
      • threat
        • 2.Qxe7#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Be6
        • 2.Qf4#
        • 2.Qg3#
        • 2.Qc5#
      • 1...e5
        • 2.Qe7#
      • 1...e6
        • 2.Qc5#
      • 1...Ke6!
    • 1.Qf6+?
      • 1...Be6
        • 2.Qf4#
      • 1...e6
        • 2.Qd4#
      • 1...exf6!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qxe7#
      • 1...Bd5
        • 2.Qxd5#
      • 1...e5
        • 2.Qc6#
      • 1...Be6
        • 2.Qf4#
      • 1...e6
        • 2.Qd4#

Anticipated by 21170(1917), 79546(1977)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(c);N_GUARD::QAR1(C),XB(c)
    • B(c);N_GUARD::QAR1(C)
    • P(b);SBLOCK::QAR1(C)
    • P(b);SBLOCK::QAB1(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • B(c);N_GUARD::QAR1(C),XB(c)
        • P(b);::QAB1(C)
        • P(b);SBLOCK::QAB1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • B(c);P_SPINB(c),SBLOCK,S_CUTP(b)::QAB(C)
        • P(b);P_SPINP(b),SBLOCK,S_CUTB(c)::QAR2(C)
      • Refutation
        • P(b);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XP(b)
    • Vars
      • B(c);N_GUARD::QAR1(C),XB(c)
      • P(b);SBLOCK::QAR1(C)
      • B(c);SBLOCK,S_CUTP(b)::QAB(C)
      • P(b);SBLOCK,S_CUTB(c)::QAR2(C)
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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).