MESON Chess Problem Database

Problem Display
PID: 18699 (8/1B2p3/bkN1N3/1P2Q3/8/8/4p3/4K3 w - - 0 1)

Zhukovin, Konstantin

Shakhmaty v SSSR, 1957

8/1B2p3/bkN1N3/1P2Q3/8/8/4p3/4K3

#2

6 + 4

3976 FIDE Album (1956-1958) 1961
3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxb7
      • 2.Qb8#
    • 1...Bxb5
      • 2.Qc7#
    • 1...Bxb7
      • 2.Qc5#
  • Tries
    • 1.Kxe2?
      • 1...Kxb7
        • 2.Qb8#
      • 1...Bxb7
        • 2.Qc5#
      • 1...Bxb5+!
    • 1.Qg3?
      • 1...Kxb5
        • 2.Qb3#
      • 1...Kxb7
        • 2.Qb8#
      • 1...Bxb5
        • 2.Qc7#
      • 1...Bxb7!
    • 1.Qd4+?
      • 1...Kxb5
        • 2.Sc7#
        • 2.Qb4#
      • 1...Kxb7!
    • 1.Qf4?
      • 1...Kxb5
        • 2.Qb4#
      • 1...Kxb7
        • 2.Qb8#
      • 1...Bxb5
        • 2.Qc7#
      • 1...Bxb7!
    • 1.Qd6?
      • 1...Kxb5
        • 2.Qb4#
      • 1...Kxb7
        • 2.Qb8#
      • 1...Bxb5
        • 2.Qc7#
      • 1...Bxb7
        • 2.Qc5#
      • 1...exd6!
    • 1.Qe3+?
      • 1...Kxb5
        • 2.Qb3#
      • 1...Kxb7!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qxa6#
      • 1...Kxb5
        • 2.Qxa6#
      • 1...Kxb7
        • 2.Qxa6#
      • 1...Bxb5
        • 2.Qa7#
      • 1...Bxb7
        • 2.Qa5#

Anticipated by 267185(1921-1923)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(c);OGATEB,P-FLIGHT,XB(F)::QAR1(C)
    • B(b);SBLOCK,XP(B)::QAB1(C)
    • B(b);SBLOCK,XB(F)::QAB1(C)
  • Tries
    • Try
      • K(A);P-FLIGHT,P_SPINP(B),XP(a)
      • Vars
        • K(c);OGATEB,P-FLIGHT,XB(F)::QAR1(C)
        • B(b);N_PINP(B),SBLOCK,XB(F)::QAB1(C)
      • Refutation
        • B(b);CHECK,XP(B)
    • Try
      • Q(C);
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(B)::QAR2(C)
        • K(c);OGATEB,P-FLIGHT,XB(F)::QAR1(C)
        • B(b);SBLOCK,XP(B)::QAB1(C)
      • Refutation
        • B(b);XB(F)
    • Try
      • Q(C);CHECK
      • Refutation
        • K(c);P-FLIGHT,XB(F)
    • Try
      • Q(C);
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(B)::QAR1(C)
        • K(c);OGATEB,P-FLIGHT,XB(F)::QAR1(C)
        • B(b);SBLOCK,XP(B)::QAB1(C)
      • Refutation
        • B(b);XB(F)
    • Try
      • Q(C);
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(B)::QAR1(C)
        • K(c);OGATEB,P-FLIGHT,XB(F)::QAR1(C)
        • B(b);SBLOCK,XP(B)::QAB1(C)
        • B(b);SBLOCK,XB(F)::QAB1(C)
      • Refutation
        • P(d);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(B)::QAR2(C)
      • Refutation
        • K(c);P-FLIGHT,XB(F)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XB(b)
    • Vars
      • K(c);P-FLIGHT,XP(B)::QAB1(C),XB(b)
      • K(c);P-FLIGHT,XB(F)::QAB1(C),XB(b)
      • B(b);OGATE,SBLOCK,XP(B)::QAB1(C)
      • B(b);SBLOCK,XB(F)::QAB1(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).