MESON Chess Problem Database

Problem Display
PID: 201457 (2B2qNB/2rnQ3/1R2n2P/4rk1P/p5R1/K1p3pP/7b/5N2 w - - 0 1)

Mari, Alberto

L'Alfiere di Re, 1922

2B2qNB/2rnQ3/1R2n2P/4rk1P/p5R1/K1p3pP/7b/5N2

#2

11 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh6
      • 2.Sxh6#
    • 1...Qxe7+
      • 2.Sxe7#
    • 1...Qxc8
      • 2.Qh7#
    • 1...Qd8
      • 2.Qh7#
    • 1...Re3
      • 2.Sxe3#
    • 1...Ra5
      • 2.Se3#
    • 1...Rb5
      • 2.Se3#
    • 1...Rec5
      • 2.Se3#
      • 2.Qxe6#
      • 2.Qh7#
    • 1...Rd5
      • 2.Se3#
    • 1...Rcc5
      • 2.Qh7#
    • 1...Bg1
      • 2.Sxg3#
    • 1...Sd4
      • 2.Qxf8#
    • 1...Sec5
      • 2.Qg5#
      • 2.Qxf8#
      • 2.Qxe5#
      • 2.Qh7#
    • 1...Sg7
      • 2.Qxf8#
    • 1...Sdc5
      • 2.Qg5#
  • Tries
    • 1.Qxf8+?
      • 1...Sexf8
        • 2.Rf6#
      • 1...Sf6
        • 2.Qxf6#
      • 1...Sdxf8!
  • Keys
    • 1.Rb5!
      • threat
        • 2.Se3#
      • 1...Qxe7+
        • 2.Sxe7#
      • 1...Qxh6
        • 2.Sxh6#
      • 1...Sf4
        • 2.Rxe5#
      • 1...Rcc5
        • 2.Qh7#
      • 1...Bg1
        • 2.Sxg3#
      • 1...Sec5
        • 2.Qxe5#
      • 1...Sdc5
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • Q(j);N_PINQ(H),XP(G)::S(J),XQ(j)
    • Q(j);CHECK,XQ(H)::S(J),XQ(j)
    • Q(j);N_PINQ(H),XB(I)::QAB(H)
    • Q(j);N_PINQ(H)::QAB(H)
    • R(e);N_GUARD::S(A),XR(e)
    • R(e);N_GUARD::S(A)
    • R(h);N_PINQ(H)::QAB(H)
    • B(a);N_GUARD::S(A),XP(c)
    • S(g);N_GUARD,P_SPINS(i)::QAR(H),XQ(j)
    • S(i);N_PINQ(H),P_SPINS(g)::QAR1(H)
  • Tries
    • Try
      • Q(H);CHECK,N_SPINQ(H),XQ(j)
      • Vars
        • S(g);OGATE,P_SPINS(i),XQ(H)::R1(F)
        • S(i);N_GUARD,P_SPINS(g)::QAR1(H),XS(i)
      • Refutation
        • S(i);P_SPINS(g),XQ(H)
  • Actual
    • R(F);P_PINR(e)
    • Threat
      • S(A)
    • Vars
      • Q(j);CHECK,XQ(H)::S(J),XQ(j)
      • Q(j);N_PINQ(H),XP(G)::S(J),XQ(j)
      • S(g);P_SPINS(i)::R1(F),XR(e)
      • R(h);N_PINQ(H),N_SPINR(e)::QAB(H)
      • B(a);N_GUARD::S(A),XP(c)
      • S(g);N_PINQ(H),N_SPINR(e),P_SPINS(i)::QAR1(H),XR(e)
      • S(i);N_PINQ(H),N_SPINR(e),P_SPINS(g)::QAR1(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).