MESON Chess Problem Database

Problem Display
PID: 201452 (1B2n2Q/K1p3r1/1N1qp3/1R1Nk1p1/6BP/p3PP2/1n1R4/8 w - - 0 1)

Mari, Alberto

L'Alfiere di Re, 1922

1B2n2Q/K1p3r1/1N1qp3/1R1Nk1p1/6BP/p3PP2/1n1R4/8

#2

11 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Sc4#
    • 1...Sd3
      • 2.Sc4#
    • 1...Sa4
      • 2.Sc4#
    • 1...Sc4
      • 2.Sxc4#
    • 1...c5+
      • 2.Sd7#
    • 1...c6+
      • 2.Sd7#
  • Tries
    • 1.Qxg7+?
      • 1...Sf6
        • 2.Qxf6#
        • 2.Qxg5#
      • 1...Sxg7!
    • 1.f4+?
      • 1...Ke4
        • 2.Rd4#
      • 1...gxf4!
  • Keys
    • 1.hxg5!
      • threat
        • 2.Qh2#
      • 1...Qxb6+
        • 2.Sxb6#
      • 1...cxb6+
        • 2.Se7#
      • 1...c5+
        • 2.Sd7#
      • 1...c6+
        • 2.Sd7#
      • 1...Qb4
        • 2.Sxb4#
      • 1...Qf8
        • 2.Se7#
      • 1...Sd3
        • 2.Sc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::S(H)
    • S(a);N_GUARD::S(H),XS(a)
    • P(g);CHECK,P_SPINQ(e)::S(H)
  • Tries
    • Try
      • Q(K);CHECK,XR(h)
      • Refutation
        • S(i);XQ(K)
    • Try
      • P(C);CHECK
      • Vars
        • K(c);N_SPINR(h),P-FLIGHT::R1(A)
      • Refutation
        • P(d);XP(C)
  • Actual
    • P(E);XP(d)
    • Threat
      • QAB(K)
    • Vars
      • Q(e);CHECK,P_SPINP(g),XS(H)::R(F)+S(G),XQ(e)
      • P(g);CHECK,N_GUARD,P_SPINQ(e),XS(H)::R(F)+S(G)
      • P(g);CHECK,P_SPINQ(e)::S(H)
      • Q(e);N_GUARD,P_SPINP(g)::R(F)+S(G),XQ(e)
      • Q(e);N_GUARD,P_SPINP(g)::R(F)+S(G)
      • S(a);N_GUARD::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).