MESON Chess Problem Database

Problem Display
PID: 172337 (8/8/7B/5Q2/6p1/6k1/8/5K2 w - - 0 1)

Andreev, Aleksandr Grigorevich

Vecherni Krasnodar, 1996

8/8/7B/5Q2/6p1/6k1/8/5K2

#2

3 + 2

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Bf4+?
      • 1...Kh3
        • 2.Qh7#
        • 2.Qh5#
      • 1...Kh4
        • 2.Qh7#
      • 1...Kf3!
    • 1.Qc2?
      • 1...Kf3
        • 2.Qd3#
        • 2.Qg2#
      • 1...Kh4
        • 2.Qh2#
      • 1...Kh3!
    • 1.Qxg4+?
      • 1...Kh2
        • 2.Qg2#
        • 2.Qh4#
      • 1...Kxg4!
    • 1.Qf4+?
      • 1...Kh4
        • 2.Qh2#
      • 1...Kh3!
    • 1.Qe5+?
      • 1...Kf3
        • 2.Qf4#
        • 2.Qe3#
      • 1...Kh4
        • 2.Qh2#
      • 1...Kh3!
    • 1.Qg5?
      • 1...Kh2
        • 2.Qh4#
      • 1...Kf3
        • 2.Qe3#
        • 2.Qf4#
      • 1...Kh3!
    • 1.Qf6?
      • 1...Kh2
        • 2.Qh4#
      • 1...Kh3!
  • Keys
    • 1.Qh7!
      • 1...Kh2
        • 2.Bf4#
      • 1...Kf3
        • 2.Qd3#
      • 1...Kh3
        • 2.Bf4#
      • 1...Kh4
        • 2.Bf4#

Anticipated by 1940(1856), 42024(1861), 52607(1875), 230682(1898), 198315(1920), 81326(1972)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK,XP(b)
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,P_SPINP(b),S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);S_FLIGHT::QAR(B)+B(C),DCHECK
      • K(a);P-FLIGHT::QAR2(B)
      • K(a);P-FLIGHT::QAR(B)+B(C)
      • K(a);S_FLIGHT::QAR(B)+B(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).