MESON Chess Problem Database

Problem Display
PID: 287062 (7b/1pQR1p1K/4k3/5N1p/2p1pP2/1b6/r7/8 w - - 0 1)

Koshel, Mikhail Igorevich

64 Shakhmatnoe obozrenie, 2026

7b/1pQR1p1K/4k3/5N1p/2p1pP2/1b6/r7/8

#2

5 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Qe5#
    • 1...f6
      • 2.Sd4#
  • Tries
    • 1.Sd4+?
      • 1...Kf6
        • 2.Rd6#
        • 2.Rxf7#
        • 2.Qe5#
        • 2.Qb6#
        • 2.Qd6#
        • 2.Qd8#
      • 1...Bxd4!
    • 1.Sg7+?
      • 1...Kf6
        • 2.Rd6#
        • 2.Rxf7#
        • 2.Qe5#
        • 2.Qb6#
        • 2.Qd6#
        • 2.Qd8#
      • 1...Bxg7!
    • 1.Rd5?
      • threat
        • 2.Qd6#
      • 1...Kxd5
        • 2.Qd6#
      • 1...Kf6
        • 2.Qe5#
        • 2.Qb6#
        • 2.Qd6#
        • 2.Qe7#
      • 1...Be5
        • 2.Qxe5#
      • 1...f6
        • 2.Qd7#
      • 1...Ra6!
    • 1.Re7+?
      • 1...Kd5
        • 2.Qd6#
      • 1...Kf6
        • 2.Qe5#
      • 1...Kxf5!
    • 1.Rxf7?
      • threat
        • 2.Qd7#
      • 1...Kd5
        • 2.Qd6#
      • 1...Ba4
        • 2.Qxc4#
      • 1...Rd2!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Rd6#
      • 1...Kxf5
        • 2.Rxf7#
      • 1...Kf6
        • 2.Rd6#
      • 1...f6
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(f);N_GUARD,P-FLIGHT,S_CUTB(i)::QAB1(C)
    • P(h);SBLOCK,S_CUTB(i)::S(B)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • B(i);XS(B)
    • Try
      • S(B);CHECK
      • Refutation
        • B(i);XS(B)
    • Try
      • R(D);
      • Threat
        • QAR1(C)
      • Vars
        • K(f);S_FLIGHT,XR(D)::QAR1(C)
        • B(i);N_GUARD::QAR1(C),XB(i)
        • P(h);SBLOCK::QAB1(C)
      • Refutation
        • R(a);
    • Try
      • R(D);CHECK
      • Vars
        • K(f);N_GUARD,S_FLIGHT::QAR1(C)
        • K(f);P-FLIGHT::QAB1(C)
      • Refutation
        • K(f);S_FLIGHT,XS(B)
    • Try
      • R(D);XP(h)
      • Threat
        • QAB1(C)
      • Vars
        • K(f);N_GUARD,S_FLIGHT::QAR1(C)
        • B(b);N_GUARD::QAB(C),XP(c)
      • Refutation
        • R(a);
  • Actual
    • Q(C);
    • Threat
      • QAB(C)+R(D),DCHECK
    • Vars
      • K(f);N_GUARD,S_FLIGHT,XS(B)::QAB(C)+R(D),DCHECK,XP(h)
      • K(f);P-FLIGHT::R(D)
      • P(h);SBLOCK,S_CUTB(i)::S(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).