MESON Chess Problem Database

Problem Display
PID: 180418 (6N1/p2p4/P2k4/pP2pP2/1q1N3K/B7/B5P1/2R4Q w - - 0 1)

Lider, Valentin Viktorovich

64 Shakhmatnoe obozrenie, 1975

6N1/p2p4/P2k4/pP2pP2/1q1N3K/B7/B5P1/2R4Q

#2

11 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...a4
      • 2.Bxb4#
    • 1...exd4
      • 2.Qh2#
    • 1...e4
      • 2.Qh2#
  • Tries
    • 1.Kg4?
      • threat
        • 2.Qh6#
      • 1...exd4
        • 2.Qh2#
      • 1...e4
        • 2.Qh2#
      • 1...Qc5!
    • 1.Kg5?
      • threat
        • 2.Qh6#
      • 1...exd4
        • 2.Qh2#
      • 1...e4
        • 2.Qh2#
      • 1...Qc5!
    • 1.Rc8?
      • 1...exd4
        • 2.Qh2#
      • 1...e4
        • 2.Qh2#
      • 1...Qc5
        • 2.Bxc5#
      • 1...a4
        • 2.Bxb4#
      • 1...Qxa3!
    • 1.Qh3?
      • 1...Qxa3
        • 2.Qxa3#
      • 1...exd4
        • 2.Qh2#
        • 2.Qg3#
      • 1...e4
        • 2.Qh2#
        • 2.Qg3#
      • 1...a4
        • 2.Bxb4#
      • 1...Qc5!
    • 1.g4?
      • threat
        • 2.Qd5#
      • 1...e4
        • 2.Qh2#
      • 1...Qc5!
    • 1.b6?
      • 1...Qxa3
        • 2.Sb5#
      • 1...exd4
        • 2.Qh2#
      • 1...e4
        • 2.Qh2#
      • 1...Qc5
        • 2.Bxc5#
      • 1...a4
        • 2.Bxb4#
      • 1...axb6!
    • 1.f6?
      • 1...Qxa3
        • 2.Sf5#
      • 1...exd4
        • 2.Qh2#
      • 1...e4
        • 2.Qh2#
      • 1...a4
        • 2.Bxb4#
      • 1...Qc5!
  • Keys
    • 1.Qd1!
      • 1...Qxa3
        • 2.Sb3#
      • 1...exd4
        • 2.Qxd4#
      • 1...Qc5
        • 2.Se6#
      • 1...e4
        • 2.Sf3#
      • 1...a4
        • 2.Bxb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);N_GUARD::B(E),XQ(a)
    • P(c);OGATEB,XS(F)::QAB(B)
    • P(c);N_PINS(F),OGATEB::QAB(B)
  • Tries
    • Try
      • K(G);P-FLIGHT
      • Threat
        • QAR(B)
      • Vars
        • P(c);OGATEB,XS(F)::QAB(B)
        • P(c);N_PINS(F),OGATEB::QAB(B)
      • Refutation
        • Q(a);N_PINS(F)
    • Try
      • K(G);N_SPINS(F),S_FLIGHT
      • Threat
        • QAR(B)
      • Vars
        • P(c);OGATEB,XS(F)::QAB(B)
        • P(c);OGATEB::QAB(B)
      • Refutation
        • Q(a);
    • Try
      • R(A);
      • Vars
        • P(c);OGATEB,XS(F)::QAB(B)
        • P(c);N_PINS(F),OGATEB::QAB(B)
        • Q(a);N_PINS(F),OGATE::B(E),XQ(a)
        • P(b);N_GUARD::B(E),XQ(a)
      • Refutation
        • Q(a);N_PINS(F),N_SPINQ(a),XB(E)
    • Try
      • Q(B);
      • Vars
        • Q(a);N_PINS(F),N_SPINQ(a),OGATE,XB(E)::QAB(B),XQ(a)
        • P(b);N_GUARD::B(E),XQ(a)
      • Refutation
        • Q(a);N_PINS(F)
    • Try
      • P(D);N_SPINS(F)
      • Threat
        • QAR1(B)
      • Vars
        • P(c);OGATEB::QAB(B)
      • Refutation
        • Q(a);
    • Try
      • P(H);
      • Vars
        • Q(a);N_PINS(F),N_SPINQ(a),XB(E)::S(F)
        • P(c);OGATEB,XS(F)::QAB(B)
        • P(c);N_PINS(F),OGATEB::QAB(B)
        • Q(a);N_PINS(F),OGATE::B(E),XQ(a)
        • P(b);N_GUARD::B(E),XQ(a)
      • Refutation
        • P(e);XP(H)
    • Try
      • P(I);
      • Vars
        • Q(a);N_PINS(F),N_SPINQ(a),XB(E)::S(F)
        • P(c);OGATEB,XS(F)::QAB(B)
        • P(c);N_PINS(F),OGATEB::QAB(B)
        • P(b);N_GUARD::B(E),XQ(a)
      • Refutation
        • Q(a);N_PINS(F)
  • Actual
    • Q(B);
    • Vars
      • Q(a);N_PINS(F),N_SPINQ(a),XB(E)::QAR(B)+S(F)
      • P(c);OGATE,P_SPINP(c),XS(F)::QAR2(B),XP(c)
      • Q(a);N_PINS(F)::QAR(B)+S(F)
      • P(c);N_PINS(F)::QAR(B)+S(F)
      • P(b);N_GUARD::B(E),XQ(a)
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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).