MESON Chess Problem Database

Problem Display
PID: 234085 (8/8/p7/B7/8/pP6/K1kpQ3/2b5 w - - 0 1)

Poluschkin, B

Chess Life, 1970

8/8/p7/B7/8/pP6/K1kpQ3/2b5

#2

4 + 5

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bb2
      • 2.Qxd2#
  • Tries
    • 1.Bc3?
      • 1...Kxc3
        • 2.Qc4#
      • 1...Bb2
        • 2.Qxd2#
      • 1...a5!
    • 1.Bb4?
      • 1...Bb2
        • 2.Qxd2#
      • 1...a5!
    • 1.Qf3?
      • 1...d1Q
        • 2.Qc3#
      • 1...d1S
        • 2.Qe4#
        • 2.Qf5#
      • 1...d1B
        • 2.Qe4#
        • 2.Qc3#
        • 2.Qf5#
      • 1...d1R
        • 2.Qc3#
      • 1...Bb2!
    • 1.Qe3?
      • 1...Bb2
        • 2.Qxd2#
      • 1...d1Q
        • 2.Qc3#
      • 1...d1S
        • 2.Qe4#
      • 1...d1B
        • 2.Qc3#
        • 2.Qe4#
      • 1...d1R
        • 2.Qc3#
      • 1...Kd1!
  • Keys
    • 1.Qf1!
      • 1...d1Q
        • 2.Qc4#
      • 1...d1S
        • 2.Qf5#
      • 1...d1B
        • 2.Qc4#
        • 2.Qf5#
      • 1...d1R
        • 2.Qc4#
      • 1...Bb2
        • 2.Qb1#

Anticipated by 22005(1923), 22080(1924), 109519(1934), 179999(1952)

This anticipates 102450(1988)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::QAR1(B),XP(c)
  • Tries
    • Try
      • B(D);
      • Vars
        • K(b);N_SPINP(c),OGATEB,P-FLIGHT,XB(D)::QAR1(B)
        • B(a);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • P(e);
    • Try
      • B(D);
      • Vars
        • B(a);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • P(e);
    • Try
      • Q(B);N_PINP(c)
      • Vars
        • P(c);SBLOCK::QAR1(B)
      • Refutation
        • B(a);
    • Try
      • Q(B);N_PINP(c)
      • Vars
        • B(a);N_GUARD::QAR1(B),XP(c)
        • P(c);SBLOCK::QAR1(B)
        • P(c);SBLOCK::QAB(B)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(B);N_PINP(c)
    • Vars
      • P(c);SBLOCK::QAR2(B)
      • P(c);SBLOCK::QAB(B)
      • B(a);OGATE::QAB1(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).