MESON Chess Problem Database

Problem Display
PID: 83490 (8/b6B/2pn4/1p2Q3/3pq1pB/1K3p2/R1Pk1n2/R2N2N1 w - - 0 1)

Ellerman, Arnoldo

Good Companions (January), 1917

8/b6B/2pn4/1p2Q3/3pq1pB/1K3p2/R1Pk1n2/R2N2N1

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2+
      • 2.Rxc2#
    • 1...Qd3+
      • 2.cxd3#
    • 1...Qd5+
      • 2.c4#
    • 1...Qxh7
      • 2.Bg5#
    • 1...Qe1
      • 2.c3#
      • 2.c4#
    • 1...Qf4
      • 2.c3#
      • 2.c4#
    • 1...d3
      • 2.Qc3#
  • Tries
    • 1.c3+?
      • 1...Ke1
        • 2.Sxf2#
      • 1...Qc2+
        • 2.Rxc2#
      • 1...Kd3!
    • 1.c4+?
      • 1...Ke1
        • 2.Sxf2#
        • 2.Sc3#
      • 1...Qc2+
        • 2.Rxc2#
      • 1...Kd3!
  • Keys
    • 1.Se3!
      • threat
        • 2.Sf1#
      • 1...Qxc2+
        • 2.Rxc2#
      • 1...Qd3+
        • 2.cxd3#
      • 1...Qd5+
        • 2.c4#
      • 1...Qxe3+
        • 2.c3#
      • 1...Kxe3
        • 2.Bg5#
      • 1...dxe3
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(e);CHECK,OGATE,P_SPINQ(e),XP(E)::R1(D),XQ(e)
    • Q(e);CHECK,OGATE::R(D)+P(E),XQ(e)
    • Q(e);CHECK,N_GUARD::R(D)+P(E)
    • Q(e);N_GUARD,XB(I)::B(G)
    • P(d);OGATE::QAB1(H)
  • Tries
    • Try
      • P(E);CHECK
      • Vars
        • K(a);P_SPINQ(e),P_SPINS(b),S_FLIGHT::R(A)+S(B),XS(b)
        • Q(e);CHECK,N_GUARD,P_SPINQ(e)::R1(D),XQ(e)
      • Refutation
        • K(a);P-FLIGHT,P_SPINQ(e)
    • Try
      • P(E);CHECK
      • Vars
        • Q(e);CHECK,N_GUARD,P_SPINQ(e)::R1(D),XQ(e)
      • Refutation
        • K(a);P-FLIGHT,P_SPINQ(e)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XP(E)::R1(D),XQ(e)
      • Q(e);CHECK,OGATE::R(D)+P(E),XQ(e)
      • Q(e);CHECK,N_GUARD::R(D)+P(E)
      • Q(e);CHECK,N_GUARD,XS(B)::R(D)+P(E)
      • K(a);OGATEB,P_SPINQ(e),S_FLIGHT,XS(B)::B(G)
      • P(d);OGATE,XS(B)::QAB1(H)
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