MESON Chess Problem Database

Problem Display
PID: 83605 (8/8/3p1Q1b/2p1N2q/4kp1p/1PP5/2P1N1RP/3KR2B w - - 0 1)

Ellerman, Arnoldo

Bristol Times and Mirror, 1926

8/8/3p1Q1b/2p1N2q/4kp1p/1PP5/2P1N1RP/3KR2B

#2

11 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2+
      • 2.Rgxe2#
    • 1...Qg6
      • 2.Sxf4#
    • 1...Qf7
      • 2.Sxf4#
    • 1...Qe8
      • 2.Sxf4#
    • 1...Qg5
      • 2.Sxf4#
    • 1...f3
      • 2.Sf4#
  • Tries
    • 1.Rg3+?
      • 1...f3
        • 2.Sf4#
      • 1...Qf3!
    • 1.Rg5+?
      • 1...Ke3
        • 2.Qxf4#
      • 1...f3
        • 2.Sf4#
      • 1...Qf3!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Rg4#
      • 1...Qxe2+
        • 2.Rgxe2#
      • 1...Qd5+
        • 2.Sd4#
      • 1...Kf3
        • 2.Sg1#
      • 1...Kd5
        • 2.Rg5#
      • 1...Qg4
        • 2.Rxg4#
      • 1...Qf3
        • 2.Qe6#
      • 1...f3
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(e);CHECK,OGATE,P_SPINQ(e),XS(E)::B(C)+R(F),DCHECK,XQ(e)
    • Q(e);N_PINS(E)::R(B)+S(E),XP(b)
    • P(b);N_PINS(E)::R(B)+S(E)
  • Tries
    • Try
      • R(F);CHECK
      • Vars
        • P(b);N_PINS(E),P_SPINP(b)::R(B)+S(E)
      • Refutation
        • Q(e);P_SPINQ(e)
    • Try
      • R(F);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(K),XP(b)
        • P(b);N_PINS(E),P_SPINP(b)::R(B)+S(E)
      • Refutation
        • Q(e);P_SPINQ(e)
  • Actual
    • S(J);
    • Threat
      • B(C)+R(F)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XS(E)::B(C)+R(F),DCHECK,XQ(e)
      • Q(e);CHECK,N_PINS(E),SBLOCK::R(B)+S(E)
      • K(a);N_PINS(E),P_SPINP(b),S_FLIGHT::S(E)
      • K(a);S_FLIGHT::B(C)+R(F),DCHECK
      • Q(e);::B(C)+R(F),XQ(e)
      • Q(e);N_GUARD,SBLOCK::QAR2(K)
      • P(b);N_PINS(E),SBLOCK::R(B)+S(E)
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