MESON Chess Problem Database

Problem Display
PID: 83477 (1B1r3n/K1p4r/1P2pP1p/R2Bk2N/2P1N3/3Q1n2/b7/8 w - - 0 1)

Ellerman, Arnoldo

3rd Prize, Good Companions (April), 1916

1B1r3n/K1p4r/1P2pP1p/R2Bk2N/2P1N3/3Q1n2/b7/8

#2

10 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb8
      • 2.Bc6#
    • 1...Rc8
      • 2.Bc6#
      • 2.Bb7#
      • 2.Ba8#
    • 1...Re8
      • 2.Bc6#
      • 2.Bb7#
      • 2.Ba8#
    • 1...Rf8
      • 2.Bc6#
      • 2.Bb7#
      • 2.Ba8#
    • 1...Rg8
      • 2.Bc6#
      • 2.Bb7#
      • 2.Ba8#
  • Tries
    • 1.Bxe6+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...Kxe6!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Bc6#
      • 1...cxb6+
        • 2.Sf7#
      • 1...cxd6+
        • 2.Bb7#
      • 1...c5+
        • 2.Sf7#
      • 1...c6+
        • 2.Sf7#
      • 1...Kxd6
        • 2.Bxf3#
      • 1...Rxd6
        • 2.Qe4#
      • 1...Bxc4
        • 2.Sxc4#
      • 1...exd5
        • 2.Qxd5#
      • 1...Sd4
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • R(h);N_GUARD,N_SPINP(f),XB(J)::R(D)+B(E)
  • Tries
    • Try
      • B(E);CHECK,XP(d)
      • Vars
        • R(h);N_GUARD,P_SPINR(h)::QAR1(A),XR(h)
      • Refutation
        • K(c);N_SPINP(f),P-FLIGHT,XB(E)
  • Actual
    • S(C);N_PINP(f)
    • Threat
      • R(D)+B(E)
    • Vars
      • P(f);CHECK,XP(G)::B(J)+S(C),DCHECK
      • P(f);CHECK,N_GUARD,P_SPINP(f),XS(C)::R(D)+B(E)
      • P(f);CHECK::B(J)+S(C),DCHECK
      • K(c);P_SPINP(f),S_FLIGHT,XS(C)::QAR(A)+B(E),XS(b)
      • R(h);SBLOCK,XS(C)::QAR1(A)
      • B(a);XP(B)::S(C),XB(a)
      • P(d);OGATE,P_SPINP(d),XB(E)::QAR1(A),XP(d)
      • S(b);OGATE,SBLOCK::QAB(A)
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