MESON Chess Problem Database

Problem Display
PID: 43753 (8/q3Np2/Q4p2/1r3N1K/1Pk1n1nR/1R2p1b1/2B1Pp2/B7 w - - 0 1)

Lawrentiev, JD

De Problemist, 1930

8/q3Np2/Q4p2/1r3N1K/1Pk1n1nR/1R2p1b1/2B1Pp2/B7

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.Sxe3#
    • 1...Se5
      • 2.Sd6#
  • Tries
    • 1.Rc3+?
      • 1...Kxb4
        • 2.Sc6#
      • 1...Sxc3!
    • 1.Qe6+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...fxe6!
  • Keys
    • 1.Rb1!
      • threat
        • 2.Bd3#
      • 1...Qxe7
        • 2.Qa2#
      • 1...Qd4
        • 2.Qa2#
      • 1...Qd7
        • 2.Qa2#
      • 1...Sc5
        • 2.Sxe3#
      • 1...Se5
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(e);N_PINS(G),P_SPINS(f)::S(G),XP(b)
    • S(f);N_PINS(G),P_SPINS(e)::S(G)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(d);N_SPINR(g),P-FLIGHT,XP(E)::S(J)
      • Refutation
        • S(e);P_SPINS(f),XR(D)
    • Try
      • Q(I);CHECK,N_PINR(g)
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::QAB1(I),XR(g)
      • Refutation
        • P(j);XQ(I)
  • Actual
    • R(D);
    • Threat
      • B(B)
    • Vars
      • Q(i);N_GUARD,XS(J)::QAB(I)
      • Q(i);N_GUARD::QAB(I)
      • S(e);N_PINS(G),P_SPINS(f)::S(G),XP(b)
      • S(f);N_PINS(G),P_SPINS(e)::S(G)
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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).