MESON Chess Problem Database

Problem Display
PID: 262490 (3RNn2/5R1B/K3p1r1/p1B5/3pk1p1/3p4/Q4pPb/2r2N2 w - - 0 1)

Ellerman, Arnoldo

Europe Echecs, 1961

3RNn2/5R1B/K3p1r1/p1B5/3pk1p1/3p4/Q4pPb/2r2N2

#2

9 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...e5+
      • 2.Sd6#
  • Tries
    • 1.Sd2+?
      • 1...Ke5
        • 2.Bxd4#
        • 2.Bd6#
      • 1...Ke3!
    • 1.Sg3+?
      • 1...Ke3
        • 2.Bxd4#
        • 2.Qxf2#
      • 1...Ke5
        • 2.Bxd4#
        • 2.Bd6#
      • 1...Bxg3!
    • 1.Bxg6+?
      • 1...Ke5
        • 2.Bxd4#
        • 2.Bd6#
      • 1...Sxg6!
    • 1.Qxe6+?
      • 1...Be5
        • 2.Sd6#
        • 2.Rxd4#
        • 2.Qc6#
      • 1...Sxe6!
    • 1.Qa4?
      • threat
        • 2.Qxd4#
      • 1...e5+
        • 2.Qc6#
      • 1...Ke5
        • 2.Qxd4#
      • 1...Be5
        • 2.Qc6#
      • 1...Rc4!
  • Keys
    • 1.Qxf2!
      • threat
        • 2.Qxd4#
      • 1...e5+
        • 2.Sf6#
      • 1...Ke5
        • 2.Qxd4#
      • 1...Rc4
        • 2.Qe1#
      • 1...Bg1
        • 2.Qf4#
      • 1...Be5
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(i);CHECK,SBLOCK,S_CUTB(c)::S(I)
  • Tries
    • Try
      • S(A);CHECK
      • Refutation
        • K(f);N_SPINR(j),P-FLIGHT,P_SPINP(e)
    • Try
      • S(A);CHECK
      • Refutation
        • B(c);XS(A)
    • Try
      • B(G);CHECK,XR(j)
      • Refutation
        • S(k);XB(G)
    • Try
      • Q(B);CHECK,P_SPINQ(B),XP(i)
      • Refutation
        • S(k);XQ(B)
    • Try
      • Q(B);P_PINP(e)
      • Threat
        • QAR1(B),XP(e)
      • Vars
        • P(i);CHECK,SBLOCK::QAB(B)
        • K(f);N_SPINP(e),N_SPINR(j),P-FLIGHT::QAB1(B),XP(e)
        • B(c);SBLOCK::QAB(B)
      • Refutation
        • R(a);N_SPINP(e)
  • Actual
    • Q(B);XP(b)
    • Threat
      • QAR1(B),XP(e)
    • Vars
      • P(i);CHECK,SBLOCK::S(I)
      • K(f);N_SPINR(j),P-FLIGHT::QAB1(B),XP(e)
      • R(a);N_GUARD::QAR(B)
      • B(c);N_GUARD::QAR1(B)
      • B(c);SBLOCK::S(A)
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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).