MESON Chess Problem Database

Problem Display
PID: 88374 (N5QK/8/p1p2p1p/PknN3R/7r/1P2p3/2Pq3b/R3B3 w - - 0 1)

Erokhin, Vladimir Alekseevich

1st Prize, Buletin Problemistic, 1974

N5QK/8/p1p2p1p/PknN3R/7r/1P2p3/2Pq3b/R3B3

#2

10 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa5
      • 2.Rxa5#
    • 1...Rh3
      • 2.c4#
    • 1...Rf4
      • 2.Sac7#
    • 1...Rxh5
      • 2.c4#
    • 1...Bg1
      • 2.Sac7#
    • 1...Bf4
      • 2.c4#
    • 1...Bc7
      • 2.Saxc7#
  • Keys
    • 1.Sf4!
      • threat
        • 2.Qc4#
        • 2.Qb8#
      • 1...Kb4
        • 2.Qc4#
      • 1...Qxa5
        • 2.Rxa5#
        • 2.Qc4#
        • 2.c4#
      • 1...Qxc2
        • 2.Sc7#
        • 2.Qb8#
      • 1...Rxf4
        • 2.Qb8#
      • 1...Rxh5
        • 2.Qc4#
      • 1...Bxf4
        • 2.Qc4#
      • 1...Qc3
        • 2.Qb8#
      • 1...Qb4
        • 2.Sc7#
        • 2.Qb8#
      • 1...Qe2
        • 2.Sc7#
        • 2.Qb8#
      • 1...Qd3
        • 2.Sc7#
        • 2.Qb8#
      • 1...Qd4
        • 2.Sc7#
        • 2.Qb8#
      • 1...Qd5
        • 2.Sc7#
      • 1...Qd6
        • 2.Qc4#
        • 2.c4#
      • 1...Qd7
        • 2.Qc4#
        • 2.c4#
      • 1...Qd8
        • 2.c4#
      • 1...f5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(a);OGATE,XP(E)::R1(A),XQ(a)
    • R(d);N_GUARD::P(C)
    • R(d);S_CUTB(b)::S(H)
    • R(d);N_GUARD,XR(G)::P(C)
    • B(b);N_GUARD::S(H)
    • B(b);S_CUTR(d)::P(C)
    • B(b);N_GUARD::S(H),XB(b)
  • Actual
    • S(F);P_PINS(f)
    • Threat
      • DUALS(2)
    • Vars
      • K(e);N_SPINS(f),P-FLIGHT,P_SPINQ(a)::QAR1(I)
      • R(d);XS(F)::QAR(I)
      • R(d);N_SPINS(f),XR(G)::QAB1(I)
      • B(b);XS(F)::QAB1(I)
      • Q(a);::QAR(I)
      • Q(a);N_SPINS(f)::S(H)
      • Q(a);P_PINQ(I)::P(C)
      • P(i);N_SPINS(f)::QAB1(I)
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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).