MESON Chess Problem Database

Problem Display
PID: 96988 (8/1kN5/8/2Q3p1/6Bp/7K/8/8 w - - 0 1)

Podushkin, Sergey

Problem (Zagreb), 1969

8/1kN5/8/2Q3p1/6Bp/7K/8/8

#2

4 + 3

5454 Near Snap 2009
3713 Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kb8
      • 2.Qb6#
  • Tries
    • 1.Kg2?
      • 1...Kb8
        • 2.Qb6#
      • 1...h3+!
    • 1.Kh2?
      • 1...Kb8
        • 2.Qb6#
      • 1...h3!
    • 1.Sb5?
      • 1...Ka8
        • 2.Qa7#
        • 2.Qc8#
      • 1...Kb8
        • 2.Qa7#
        • 2.Qc8#
      • 1...Ka6!
    • 1.Bf3+?
      • 1...Kb8
        • 2.Sa6#
      • 1...Kc8!
    • 1.Bf5?
      • 1...Kb8
        • 2.Qb6#
      • 1...g4+!
    • 1.Be6?
      • 1...Kb8
        • 2.Qb6#
      • 1...g4+!
    • 1.Bd7?
      • 1...Kb8
        • 2.Qb6#
      • 1...g4+!
    • 1.Qd6?
      • 1...Kb8
        • 2.Qb6#
      • 1...Ka7!
    • 1.Qa5?
      • 1...Kb8
        • 2.Qb6#
      • 1...Kc6!
  • Keys
    • 1.Sa6!
      • 1...Kxa6
        • 2.Bc8#
      • 1...Ka8
        • 2.Bf3#

Anticipated by 207026(1862), 193931(1916), 108837(1926), 6185(1927), 207089(1951)

This anticipates 12478(1979), 221072(1998), 217467(1999)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(c);P-FLIGHT::QAR2(C)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
      • Refutation
        • P(a);
    • Try
      • S(D);
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • B(B);CHECK
      • Vars
        • K(c);P-FLIGHT::S(D)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
      • Refutation
        • P(b);CHECK
    • Try
      • B(B);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
      • Refutation
        • P(b);CHECK
    • Try
      • B(B);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(C);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • S(D);
    • Vars
      • K(c);S_FLIGHT,XS(D)::B(B)
      • K(c);S_FLIGHT::B(B)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).