MESON Chess Problem Database

Problem Display
PID: 83509 (1Q6/4p3/p3B3/P3R1K1/3kP2R/qn2p3/1nP5/4Bb2 w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1919

1Q6/4p3/p3B3/P3R1K1/3kP2R/qn2p3/1nP5/4Bb2

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bd3
      • 2.c3#
    • 1...Sd3
      • 2.c3#
    • 1...Sc4
      • 2.Rd5#
  • Tries
    • 1.Qd8+?
      • 1...Kxe5
        • 2.Qd5#
      • 1...Qd6!
  • Keys
    • 1.Rc5!
      • threat
        • 2.Qe5#
      • 1...Qxc5+
        • 2.e5#
      • 1...Kxc5
        • 2.Qb6#
      • 1...Sxc5
        • 2.Qh8#
      • 1...e2
        • 2.Bf2#
      • 1...Sd3
        • 2.Rc4#
      • 1...Sc4
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::P(B)
    • S(b);SBLOCK::P(B)
    • S(b);SBLOCK::R1(F)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • K(f);S_FLIGHT,XR(F)::QAR1(I)
      • Refutation
        • Q(c);P_SPINQ(c)
  • Actual
    • R(F);
    • Threat
      • QAB1(I)
    • Vars
      • Q(c);CHECK,SBLOCK,XR(F)::R(D)+P(C)
      • K(f);OGATEB,S_FLIGHT,XR(F)::QAB1(I)
      • S(d);SBLOCK,XR(F)::QAB(I)
      • P(e);OGATEB::B(A)
      • S(b);N_GUARD,S_CUTB(a)::R1(F)
      • S(b);SBLOCK::R1(F)
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