MESON Chess Problem Database

Problem Display
PID: 78282 (r1k5/P2p1n1P/P3PB1p/4Qp1r/3N4/Kp3Rbb/8/3R3q w - - 0 1)

Loshinski, Lev Ilich

Umnov, Evgeny Ivanovich

5th Prize, Source?, 1931

r1k5/P2p1n1P/P3PB1p/4Qp1r/3N4/Kp3Rbb/8/3R3q

#2

10 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd1
      • 2.Rc3#
    • 1...Qg1
      • 2.Rc3#
    • 1...Qh2
      • 2.Rc3#
    • 1...Rb8
      • 2.axb8Q#
      • 2.axb8R#
    • 1...Be1
      • 2.Qc5#
    • 1...Bf2
      • 2.Qc5#
    • 1...Bh4
      • 2.Qc5#
    • 1...Sg5
      • 2.h8Q#
      • 2.h8R#
    • 1...Sd6
      • 2.Qc5#
    • 1...d5
      • 2.Rc3#
  • Tries
    • 1.h8Q+?
      • 1...Sd8
        • 2.Qxd8#
      • 1...Sxh8!
    • 1.h8R+?
      • 1...Sd8
        • 2.Rxd8#
      • 1...Sxh8!
  • Keys
    • 1.Sb5!
      • threat
        • 2.exd7#
      • 1...Qxd1
        • 2.Rc3#
      • 1...Rxa7
        • 2.Sxa7#
      • 1...Sxe5
        • 2.h8Q#
        • 2.h8R#
      • 1...dxe6
        • 2.Qxe6#
      • 1...Sd6
        • 2.Qc5#
      • 1...f4
        • 2.Qc7#
      • 1...d5
        • 2.Rc3#
      • 1...d6
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD,XR(A)::R(C)
    • Q(a);N_GUARD::R(C)
    • R(j);OGATE::PXR(j)=Q
    • B(c);N_GUARD::QAR(E)
    • S(i);N_GUARD::P=Q
    • S(i);S_CUTB(c)::QAR(E)
    • P(h);S_CUTQ(a)::R(C)
  • Tries
    • Try
      • P(J);CHECK
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::QAR1(J),XS(i)
      • Refutation
        • S(i);XQ(J)
    • Try
      • P(J);CHECK
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::R1(J),XS(i)
      • Refutation
        • S(i);XR(J)
  • Actual
    • S(D);
    • Threat
      • P(G),XP(h)
    • Vars
      • Q(a);N_GUARD,XR(A)::R(C)
      • R(j);P_PINP(F),XP(I)::S(D),XR(j)
      • S(i);N_GUARD,XQ(E)::P=Q
      • P(h);OGATE,XP(G)::QAB(E),XP(h)
      • S(i);S_CUTB(c)::QAR(E)
      • P(e);S_CUTB(c)::QAR1(E)
      • P(h);S_CUTQ(a)::R(C)
      • P(h);S_CUTB(c)::QAR(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).