MESON Chess Problem Database

Problem Display
PID: 271544 (Qb6/3p3K/n1pP1kP1/4R3/1R1n2pP/4N1B1/4b3/8 w - - 0 1)

Petrov, Evgeny Aleksandrovich

3rd HM., Buletin Problemistic, 1977

Qb6/3p3K/n1pP1kP1/4R3/1R1n2pP/4N1B1/4b3/8

#2

9 + 8

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Sxg4#
    • 1...Bd3
      • 2.Sxg4#
    • 1...Bc4
      • 2.Sxg4#
    • 1...Bb5
      • 2.Sxg4#
    • 1...Bxd6
      • 2.Qh8#
    • 1...Ba7
      • 2.Qd8#
      • 2.Qf8#
      • 2.Qh8#
    • 1...Bc7
      • 2.Qf8#
      • 2.Qh8#
    • 1...Sf3
      • 2.Sxg4#
    • 1...Se6
      • 2.Rf5#
    • 1...c5
      • 2.Sd5#
  • Tries
    • 1.Rxb8?
      • threat
        • 2.Rf8#
      • 1...Bc4
        • 2.Sxg4#
      • 1...Se6
        • 2.Rf5#
      • 1...Sxb8!
    • 1.Qxb8?
      • threat
        • 2.Qd8#
        • 2.Qf8#
        • 2.Qh8#
      • 1...Bc4
        • 2.Sxg4#
        • 2.Qd8#
        • 2.Qh8#
      • 1...Sf5
        • 2.Qf8#
      • 1...Se6
        • 2.Rf5#
      • 1...Sxb8!
  • Keys
    • 1.Re7!
      • threat
        • 2.Be5#
      • 1...Bxd6
        • 2.Qf8#
      • 1...Sf3
        • 2.Rf4#
      • 1...Se6
        • 2.Rf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • B(a);N_GUARD::S(A),XP(c)
    • B(a);N_GUARD,P_PINP(G)::S(A),XP(c)
    • B(h);OGATE,XP(F)::QAB(I)
    • S(b);S_CUTB(a)::S(A),XP(c)
    • S(b);N_GUARD,SBLOCK::R1(E)
    • P(e);N_GUARD::S(A)
  • Tries
    • Try
      • R(C);XB(h)
      • Threat
        • R(C)
      • Vars
        • B(a);N_GUARD::S(A),XP(c)
        • S(b);N_GUARD,SBLOCK::R1(E)
      • Refutation
        • S(d);XR(C)
    • Try
      • Q(I);XB(h)
      • Threat
        • DUALS(3)
      • Vars
        • S(b);::QAR2(I)
        • S(b);N_GUARD,SBLOCK::R1(E)
      • Refutation
        • S(d);XQ(I)
  • Actual
    • R(E);
    • Threat
      • B(B)
    • Vars
      • B(h);OGATE,XP(F)::QAR2(I)
      • S(b);OGATE::R(C)
      • S(b);SBLOCK::R1(E)
HTML5 logo

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).