MESON Chess Problem Database

Problem Display
PID: 83612 (1R4N1/1N1k1pPp/P2rpB2/PK2ppn1/Bp4rb/3R3p/3n2b1/4q2Q w - - 0 1)

Ellerman, Arnoldo

Il Problema, 1931

1R4N1/1N1k1pPp/P2rpB2/PK2ppn1/Bp4rb/3R3p/3n2b1/4q2Q

#2

11 + 15

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5+
      • 2.Kb6#
    • 1...Bf1
      • 2.Qc6#
    • 1...Bc6+
      • 2.Qxc6#
    • 1...Bxb7
      • 2.Qxb7#
  • Tries
    • 1.Kc5+?
      • 1...Bc6
        • 2.Qxc6#
      • 1...Kc7!
  • Keys
    • 1.Bd8!
      • threat
        • 2.Sf6#
      • 1...Rd5+
        • 2.Kb6#
      • 1...Bc6+
        • 2.Qxc6#
      • 1...Ke8
        • 2.Sf6#
      • 1...Sde4
        • 2.Kc4#
      • 1...Sgf3
        • 2.Kc5#
      • 1...Sge4
        • 2.Kxb4#
      • 1...f6
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(k);CHECK::B(C)+K(E)
    • B(c);OGATE,P_PINR(B)::QAB1(A)
    • B(c);CHECK,OGATE::QAB1(A),XB(c)
    • B(c);OGATE,XS(H)::QAR2(A),XB(c)
  • Tries
    • Try
      • K(E);CHECK,P-FLIGHT
      • Vars
        • B(c);OGATE,P_SPINB(c)::QAB1(A),XB(c)
      • Refutation
        • K(m);N_SPINR(k),P-FLIGHT
  • Actual
    • B(G);
    • Threat
      • S(K)
    • Vars
      • R(k);CHECK::B(C)+K(E)
      • B(c);CHECK,OGATE::QAB1(A),XB(c)
      • K(m);N_SPINR(k),S_FLIGHT::S(K)
      • S(b);::B(C)+K(E)
      • S(j);S_CUTB(c)::B(C)+K(E)
      • S(j);::B(C)+K(E),XP(e)
      • P(n);::S(K),XP(n)
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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).