MESON Chess Problem Database

Problem Display
PID: 201374 (8/2Q5/1pBPp3/1Rbpk1K1/1p2p3/1P2n1p1/2NR1Pp1/6B1 w - - 0 1)

Berger, Johann Nepomuk

L'Alfiere di Re, 1922

8/2Q5/1pBPp3/1Rbpk1K1/1p2p3/1P2n1p1/2NR1Pp1/6B1

#2

10 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bd4
      • 2.d7#
    • 1...Bxd6
      • 2.Qg7#
    • 1...gxf2
      • 2.Bh2#
    • 1...d4
      • 2.d7#
  • Tries
    • 1.Rxd5+?
      • 1...exd5
        • 2.Qe7#
      • 1...Sxd5!
    • 1.fxe3?
      • 1...Bxd6
        • 2.Qg7#
      • 1...Bd4
        • 2.exd4#
        • 2.d7#
      • 1...d4
        • 2.exd4#
        • 2.d7#
      • 1...Bxe3+!
  • Keys
    • 1.Re2!
      • 1...Bxd6
        • 2.Qg7#
      • 1...Sxc2
        • 2.f4#
      • 1...gxf2
        • 2.Bh2#
      • 1...Sd1
        • 2.f4#
      • 1...Bd4
        • 2.d7#
      • 1...Sf1
        • 2.f4#
      • 1...Sc4
        • 2.f4#
      • 1...Sg4
        • 2.f4#
      • 1...Sf5
        • 2.f4#
      • 1...d4
        • 2.d7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • B(f);N_GUARD,P_SPINP(g)::QAB(J)+P(I)
    • B(f);P_SPINB(f),P_SPINP(g),SBLOCK,XP(I)::QAB(J)
    • P(c);OGATEB,XP(D)::B(A)
    • P(g);P_SPINB(f)::QAB(J)+P(I)
  • Tries
    • Try
      • R(C);CHECK,XP(g)
      • Vars
        • P(j);S_CUTS(b),XR(C)::QAR2(J)
      • Refutation
        • S(b);XR(C)
    • Try
      • P(D);XS(b)
      • Vars
        • B(f);P_SPINB(f),P_SPINP(g),SBLOCK,XP(I)::QAB(J)
      • Refutation
        • B(f);CHECK,P_SPINP(g),XP(D)
  • Actual
    • R(C);
    • Vars
      • B(f);P_SPINB(f),P_SPINP(g),SBLOCK,XP(I)::QAB(J)
      • S(b);P_SPINP(e),XS(B)::P(D)
      • P(c);OGATEB,XP(D)::B(A)
      • S(b);P_SPINP(e)::P(D)
      • B(f);N_GUARD,P_SPINP(g)::QAB(J)+P(I)
      • P(g);P_SPINB(f)::QAB(J)+P(I)
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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).