MESON Chess Problem Database

Problem Display
PID: 172505 (8/8/1p6/pkp5/4Q2R/K7/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 2001

8/8/1p6/pkp5/4Q2R/K7/8/8

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...a4
      • 2.Qxa4#
    • 1...c4
      • 2.Qxc4#
  • Tries
    • 1.Ka2?
      • 1...a4
        • 2.Qxa4#
      • 1...c4
        • 2.Qxc4#
      • 1...Ka6!
    • 1.Kb2?
      • 1...a4
        • 2.Qxa4#
      • 1...c4
        • 2.Qxc4#
      • 1...Ka6!
    • 1.Kb3?
      • 1...a4+
        • 2.Qxa4#
      • 1...c4+
        • 2.Qxc4#
      • 1...Ka6!
    • 1.Rf4?
      • 1...a4
        • 2.Qxa4#
      • 1...c4
        • 2.Qxc4#
      • 1...Ka6!
    • 1.Rg4?
      • 1...a4
        • 2.Qxa4#
      • 1...c4
        • 2.Qxc4#
      • 1...Ka6!
    • 1.Rh5?
      • 1...a4
        • 2.Qxa4#
      • 1...Ka6!
    • 1.Qd3+?
      • 1...c4
        • 2.Qxc4#
      • 1...Kc6!
    • 1.Qb7?
      • 1...c4
        • 2.Rh5#
      • 1...a4!
    • 1.Qe2+?
      • 1...c4
        • 2.Qxc4#
      • 1...Kc6!
  • Keys
    • 1.Qa8!
      • 1...c4
        • 2.Rh5#
      • 1...a4
        • 2.Qxa4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • P(a);::QAB1(B),XP(a)
    • P(c);::QAB1(B),XP(c)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(a);::QAB1(B),XP(a)
        • P(c);::QAB1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • K(A);S_FLIGHT
      • Vars
        • P(a);::QAB1(B),XP(a)
        • P(c);::QAB1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(a);CHECK::QAB1(B),XP(a)
        • P(c);CHECK::QAB1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • P(a);::QAB1(B),XP(a)
        • P(c);::QAB1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • P(a);::QAB1(B),XP(a)
        • P(c);::QAB1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(C);P_PINP(c)
      • Vars
        • P(a);::QAB1(B),XP(a)
      • Refutation
        • K(b);N_SPINP(c),S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAB1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);P_PINP(d)
      • Vars
        • P(c);OGATEB,SBLOCK::R(C)
      • Refutation
        • P(a);
    • Try
      • Q(B);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAB1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • P(c);OGATEB,SBLOCK::R(C)
      • P(a);OGATE::QAB1(B),XP(a)
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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).