MESON Chess Problem Database

Problem Display
PID: 241131 (8/K7/1Q4Pn/p3Nb2/r4k2/8/5NRP/1B2Rnq1 w - - 0 1)

Erokhin, Vladimir Alekseevich

Shakhmaty (Riga), 1976

8/K7/1Q4Pn/p3Nb2/r4k2/8/5NRP/1B2Rnq1

#2

9 + 7

15148 Sadier Collection 2021
5454 Near Snap 2026

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf2
      • 2.Qxf2#
    • 1...Re4
      • 2.Sfd3#
    • 1...Bh3
      • 2.Sxh3#
    • 1...Bxg6
      • 2.Sh3#
    • 1...Sd2
      • 2.Qe3#
    • 1...Sxh2
      • 2.Qe3#
    • 1...Se3
      • 2.Qxe3#
    • 1...Sg3
      • 2.Qe3#
    • 1...Sg4
      • 2.Sh3#
  • Tries
    • 1.Re4+?
      • 1...Rxe4
        • 2.Sfd3#
      • 1...Bxe4!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qg5#
      • 1...Qxf2+
        • 2.Rxf2#
      • 1...Qxg2
        • 2.Sfd3#
      • 1...Re4
        • 2.Rxe4#
      • 1...Se3
        • 2.Sh3#
      • 1...Sg3
        • 2.hxg3#
      • 1...Sg4
        • 2.Qxf5#
      • 1...Sf7
        • 2.Qxf5#

This anticipates 285805(1977)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(b);OGATE,P_PINQ(G),XS(C)::QAR2(G),XQ(b)
    • R(c);S_CUTB(f)::S(C)
    • B(f);N_GUARD::S(C),XB(f)
    • B(f);N_GUARD,XP(H)::S(C)
    • S(a);N_GUARD::QAB1(G)
    • S(a);N_GUARD,XP(E)::QAB1(G)
    • S(a);N_GUARD::QAB1(G),XS(a)
    • S(g);S_CUTB(f)::S(C)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • R(c);SBLOCK,XR(B)::S(C)
      • Refutation
        • B(f);XR(B)
  • Actual
    • Q(G);P_PINB(f),P_SPINS(C)
    • Threat
      • QAB1(G)
    • Vars
      • Q(b);CHECK,OGATE,XS(C)::R(D),XQ(b)
      • Q(b);N_PINS(C),XR(D)::S(C)
      • R(c);N_GUARD::R1(B),XR(c)
      • S(a);N_PINS(C)::S(C)
      • S(a);OGATE::P(E),XS(a)
      • S(g);N_GUARD::QAR1(G),XB(f)
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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).