MESON Chess Problem Database

Problem Display
PID: 120748 (2RR4/B7/1N1Pp3/K4p2/PpNk1q2/1r1P1PQ1/2P1p1n1/8 w - - 0 1)

Umnov, Evgeny Ivanovich

Nepszava, 1930

2RR4/B7/1N1Pp3/K4p2/PpNk1q2/1r1P1PQ1/2P1p1n1/8

#2

12 + 8

35 L'Italia Scacchistica 1930
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Qe5#
    • 1...Qd2
      • 2.Qe5#
    • 1...Qe5+
      • 2.Qxe5#
    • 1...Qg5
      • 2.Qe5#
    • 1...Qxd6
      • 2.Qe5#
    • 1...Qh6
      • 2.Qe5#
    • 1...Qxf3
      • 2.Qe5#
    • 1...Qg4
      • 2.Qe5#
    • 1...Qh4
      • 2.Qe5#
  • Tries
    • 1.Sd7+?
      • 1...Kd5
        • 2.Sf6#
      • 1...Kc3!
    • 1.Qg7+?
      • 1...Qe5+
        • 2.Qxe5#
      • 1...e5!
  • Keys
    • 1.Se3!
      • threat
        • 2.Sd7#
      • 1...Qe5+
        • 2.Sbd5#
      • 1...Kxe3
        • 2.Sc4#
      • 1...Ke5
        • 2.Qg7#
      • 1...Qxe3
        • 2.Rc4#
      • 1...Qxd6
        • 2.Sa8#
      • 1...Sxe3
        • 2.Qxf4#
      • 1...Rc3
        • 2.Sbc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • Q(f);OGATE::QAB1(D)
    • Q(f);CHECK,OGATE::QAB1(D),XQ(f)
    • Q(f);OGATE,P_SPINQ(f),XP(I)::QAB1(D)
    • Q(f);OGATE,XP(C)::QAB1(D)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(e);P-FLIGHT::S(H)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • Q(f);CHECK,N_GUARD,P_SPINQ(f)::QAB1(D),XQ(f)
      • Refutation
        • P(h);P_SPINP(h)
  • Actual
    • S(F);
    • Threat
      • B(J)+S(H)
    • Vars
      • Q(f);CHECK::B(J)+S(H)
      • K(e);S_FLIGHT,XS(F)::B(J)+S(H),DCHECK
      • K(e);P_SPINQ(f),S_FLIGHT::QAB(D)
      • Q(f);SBLOCK,XS(F)::R1(K)
      • Q(f);P_SPINQ(f),XP(I)::B(J)+S(H)
      • S(b);N_GUARD,XS(F)::QAR2(D),XQ(f)
      • R(c);SBLOCK::B(J)+S(H)
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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).