MESON Chess Problem Database

Problem Display
PID: 158101 (8/3NK3/8/3k4/Q7/4P3/2Pn4/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

200 Shakhmatni Zadachi, 1983

8/3NK3/8/3k4/Q7/4P3/2Pn4/8

#2

5 + 2

15148 Sadier Collection 2016
5454 Near Snap 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.e4#
    • 1...Sf1
      • 2.e4#
    • 1...Sb3
      • 2.e4#
    • 1...Sf3
      • 2.e4#
    • 1...Sc4
      • 2.Qa8#
    • 1...Se4
      • 2.c4#
  • Tries
    • 1.Sb6+?
      • 1...Ke5
        • 2.Qf4#
      • 1...Kc5!
    • 1.Sf6+?
      • 1...Ke5
        • 2.Qb5#
        • 2.Qf4#
        • 2.Qa5#
      • 1...Kc5!
    • 1.c4+?
      • 1...Sxc4
        • 2.Qa8#
      • 1...Ke4!
  • Keys
    • 1.c3!
      • 1...Sc4
        • 2.Qa8#
      • 1...Sb1
        • 2.e4#
      • 1...Sf1
        • 2.e4#
      • 1...Sb3
        • 2.e4#
      • 1...Sf3
        • 2.e4#
      • 1...Se4
        • 2.c4#

This anticipates 24689(1987)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::P(B)
    • S(a);SBLOCK::QAB(C)
    • S(a);N_GUARD,SBLOCK::P(A)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(D);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(A);CHECK
      • Vars
        • S(a);SBLOCK,XP(A)::QAB(C)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • P(A);
    • Vars
      • S(a);SBLOCK::QAB(C)
      • S(a);N_GUARD::P(B)
      • S(a);N_GUARD,SBLOCK::P(A)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).