MESON Chess Problem Database

Problem Display
PID: 204370 (K7/1N1pp3/k5qR/P2Q3r/2P1B2n/8/1b6/1R6 w - - 0 1)

Mari, Alberto

L'Alfiere di Re, 1925

K7/1N1pp3/k5qR/P2Q3r/2P1B2n/8/1b6/1R6

#2

8 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Rxb6#
    • 1...Rxh6
      • 2.Qb5#
    • 1...Be5
      • 2.Qb5#
    • 1...Bf6
      • 2.Rb6#
    • 1...Sf5
      • 2.Qb5#
    • 1...d6
      • 2.Qc6#
    • 1...e5
      • 2.Qb5#
    • 1...e6
      • 2.Qd6#
  • Tries
    • 1.Rxg6+?
      • 1...Bf6
        • 2.Rb6#
      • 1...d6
        • 2.Qc6#
      • 1...e6
        • 2.Qd6#
      • 1...Sxg6!
  • Keys
    • 1.Bd3!
      • threat
        • 2.c5#
      • 1...Rxd5
        • 2.cxd5#
      • 1...Rxh6
        • 2.Qb5#
      • 1...Bf6
        • 2.Rb6#
      • 1...d6
        • 2.Qc6#
      • 1...e6
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(e);OGATE::R1(F),XQ(e)
    • R(c);N_GUARD,N_SPINQ(e),SBLOCK,XR(F)::QAB1(E)
    • B(a);S_CUTR(c)::QAB1(E)
    • B(a);N_SPINQ(e),OGATE::R1(A)
    • S(b);S_CUTR(c)::QAB1(E)
    • P(f);N_GUARD,N_SPINQ(e),S_CUTQ(e)::QAR2(E)
    • P(g);S_CUTR(c)::QAB1(E)
    • P(g);N_GUARD,N_SPINQ(e),S_CUTQ(e)::QAR(E)
  • Tries
    • Try
      • R(F);CHECK,XQ(e)
      • Vars
        • B(a);OGATE,P_SPINB(a)::R1(A)
        • P(f);N_GUARD,P_SPINP(f)::QAR2(E)
        • P(g);N_GUARD,P_SPINP(g)::QAR(E)
      • Refutation
        • S(b);XR(F)
  • Actual
    • B(C);
    • Threat
      • B(C)+P(B)
    • Vars
      • R(c);OGATE,XQ(E)::B(C)+P(B),XR(c)
      • R(c);N_GUARD,N_SPINQ(e),SBLOCK,XR(F)::QAB1(E)
      • B(a);N_SPINQ(e),OGATE::R1(A)
      • P(f);N_GUARD,N_SPINQ(e),S_CUTQ(e)::QAR2(E)
      • P(g);N_GUARD,N_SPINQ(e),S_CUTQ(e)::QAR(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).