MESON Chess Problem Database

Problem Display
PID: 203800 (8/4N1p1/8/3Np3/4k3/2p1P3/1nr1Bn1K/1Q4R1 w - - 0 1)

Lertoria, Ernest

The Problemist, 1954

8/4N1p1/8/3Np3/4k3/2p1P3/1nr1Bn1K/1Q4R1

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sbd1
      • 2.Qb4#
    • 1...Sa4
      • 2.Qb4#
    • 1...Sfd1
      • 2.Rg4#
    • 1...Sh1
      • 2.Rg4#
    • 1...Sg4+
      • 2.Rxg4#
  • Tries
    • 1.Qxc2+?
      • 1...Sfd3
        • 2.Rg4#
      • 1...Sbd3!
    • 1.Qf1?
      • threat
        • 2.Qg2#
      • 1...Sg4+
        • 2.Rxg4#
      • 1...Rxe2!
  • Keys
    • 1.Rg3!
      • threat
        • 2.Sxc3#
      • 1...Sg4+
        • 2.Rxg4#
      • 1...Sbd1
        • 2.Qb4#
      • 1...Sbd3
        • 2.Bf3#
      • 1...Sa4
        • 2.Qb4#
      • 1...Sfd1
        • 2.Rg4#
      • 1...Sfd3
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(a);OGATE::QAR(A)
    • S(c);N_GUARD,P_PINB(C)::R(B)
    • S(c);CHECK,N_GUARD,P_PINB(C)::R(B),XS(c)
  • Tries
    • Try
      • Q(A);CHECK,XR(b)
      • Vars
        • S(c);P_SPINS(c)::R(B)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);N_PINR(b)
      • Threat
        • QAB(A)
      • Vars
        • S(c);CHECK,N_GUARD,P_PINB(C)::R(B),XS(c)
      • Refutation
        • R(b);XB(C)
  • Actual
    • R(B);
    • Threat
      • S(F),XP(d)
    • Vars
      • S(c);CHECK,N_GUARD,P_PINB(C)::R(B),XS(c)
      • S(a);OGATE::QAR(A)
      • S(a);N_SPINR(b),SBLOCK::B(C)
      • S(c);N_GUARD,P_PINB(C)::R(B)
      • S(c);N_GUARD,N_SPINR(b),P_PINB(C)::QAB(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).