MESON Chess Problem Database

Problem Display
PID: 177754 (8/5n2/8/7b/k6K/8/5n2/1R4Q1 w - - 0 1)

Zakharov, O

Sahs (Latvia), 1986

8/5n2/8/7b/k6K/8/5n2/1R4Q1

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qa7#
    • 1...Sh1
      • 2.Qa7#
    • 1...Sd3
      • 2.Qa7#
    • 1...Sh3
      • 2.Qa7#
    • 1...Se4
      • 2.Qa7#
    • 1...Sg4
      • 2.Qa7#
  • Tries
    • 1.Rb2?
      • threat
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ka5
        • 2.Qa1#
      • 1...Sd1
        • 2.Qa7#
      • 1...Bd1!
    • 1.Rb7?
      • threat
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ka5
        • 2.Qa1#
      • 1...Sd1
        • 2.Qa7#
      • 1...Bd1!
    • 1.Rb8?
      • threat
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ka5
        • 2.Qa1#
      • 1...Sd1
        • 2.Qa7#
      • 1...Bd1!
    • 1.Qxf2?
      • threat
        • 2.Qa7#
        • 2.Qa2#
      • 1...Ka3
        • 2.Qa7#
      • 1...Ka5
        • 2.Qa7#
        • 2.Qa2#
      • 1...Be2!
    • 1.Qe1?
      • threat
        • 2.Qb4#
      • 1...Ka3
        • 2.Qa5#
      • 1...Sd3!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ka5
        • 2.Qa1#
      • 1...Se5
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • S(a);OGATE::QAR(B)
  • Tries
    • Try
      • R(A);
      • Threat
        • QAR(B)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
        • K(b);P-FLIGHT::QAR(B)
        • S(a);OGATE::QAR(B)
      • Refutation
        • B(c);
    • Try
      • R(A);
      • Threat
        • QAR(B)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
        • K(b);P-FLIGHT::QAR(B)
        • S(a);OGATE::QAR(B)
      • Refutation
        • B(c);
    • Try
      • R(A);
      • Threat
        • QAR(B)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
        • K(b);P-FLIGHT::QAR(B)
        • S(a);OGATE::QAR(B)
      • Refutation
        • B(c);
    • Try
      • Q(B);XS(a)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR(B)
      • Refutation
        • B(c);
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
      • Refutation
        • S(a);
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • K(b);P-FLIGHT::QAR2(B)
      • K(b);P-FLIGHT::QAR(B)
      • S(d);OGATE::QAR(B)
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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).