MESON Chess Problem Database

Problem Display
PID: 66317 (4R3/B2Nb3/B2N3Q/8/1K1P1q2/Rn1bk3/2PppnP1/3rr3 w - - 0 1)

Leites, Samuil Davidovich

Tijdschrift vd NSB, 1931

4R3/B2Nb3/B2N3Q/8/1K1P1q2/Rn1bk3/2PppnP1/3rr3

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qg5
      • 2.Qxg5#
    • 1...Bc4
      • 2.d5#
    • 1...Be4
      • 2.d5#
  • Tries
    • 1.Rxe7+?
      • 1...Be4
        • 2.Sc4#
        • 2.Sf5#
        • 2.d5#
      • 1...Se4!
    • 1.Qh3+?
      • 1...Qg3
        • 2.Qxg3#
      • 1...Qf3
        • 2.Qxf3#
      • 1...Sxh3!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Sd5#
      • 1...Sh1
        • 2.Sg4#
      • 1...Sh3
        • 2.Sg4#
      • 1...Se4
        • 2.Sg4#
      • 1...Sg4
        • 2.Sxg4#
      • 1...Sc5
        • 2.Sf5#
      • 1...Bc4
        • 2.d5#
      • 1...Be4
        • 2.d5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(i);N_PINP(E),OGATEB::QAB(H),XQ(i)
    • B(g);N_PINP(E),P_SPINS(f)::B(I)+P(E)
    • B(g);N_PINP(E),N_SPINB(j),P_SPINS(f)::B(I)+P(E)
  • Tries
    • Try
      • R(K);CHECK,N_SPINS(G),XB(j)
      • Refutation
        • S(e);N_PINP(E),P_SPINS(e)
    • Try
      • Q(H);CHECK,N_PINQ(i)
      • Vars
        • Q(i);N_GUARD,N_PINP(E),P_SPINQ(i)::QAR2(H),XQ(i)
        • Q(i);N_GUARD,N_PINP(E),P_SPINQ(i)::QAR1(H),XQ(i)
      • Refutation
        • S(e);XQ(H)
  • Actual
    • S(J);
    • Threat
      • S(J)
    • Vars
      • S(e);N_GUARD::S(J)
      • S(e);N_GUARD,N_PINP(E),N_SPINB(j)::S(J)
      • S(e);N_GUARD::S(J),XS(e)
      • S(f);N_PINS(G),N_SPINB(j),P_SPINB(g)::S(G)
      • B(g);N_PINP(E),P_SPINS(f)::B(I)+P(E)
      • B(g);N_PINP(E),N_SPINB(j),P_SPINS(f)::B(I)+P(E)
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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).