MESON Chess Problem Database

Problem Display
PID: 238690 (3Q4/3K4/pp6/k2NR3/Brp5/1p6/N7/R3r3 w - - 0 1)

Ahues, Herbert Siegfried Oskar

idee & form, 2019

3Q4/3K4/pp6/k2NR3/Brp5/1p6/N7/R3r3

#2

7 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa4
      • 2.Sac3#
    • 1...Rxa4
      • 2.Se3#
      • 2.Qxb6#
  • Tries
    • 1.Se3+?
      • 1...Kxa4
        • 2.Sc1#
        • 2.Sc3#
      • 1...Rb5!
    • 1.Qxb6+?
      • 1...Kxa4
        • 2.Sc1#
        • 2.Sac3#
        • 2.Qxb4#
        • 2.Qxa6#
      • 1...Rxb6!
  • Keys
    • 1.Bb5!
      • threat
        • 2.Qxb6#
      • 1...Kxb5
        • 2.Sdc3#
      • 1...Rxb5
        • 2.Sc1#
      • 1...axb5
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(e);N_SPINP(g),P-FLIGHT,XB(C)::R(A)+S(B),DCHECK
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • Q(G);CHECK,XP(g)
      • Refutation
        • R(c);XQ(G)
  • Actual
    • B(C);
    • Threat
      • QAB1(G),XP(g)
    • Vars
      • K(e);N_SPINP(g),P-FLIGHT,XB(C)::R(E)+S(D),DCHECK
      • R(c);N_GUARD,SBLOCK,XB(C)::R(A)+S(B)
      • P(f);OGATEB,SBLOCK,XB(C)::QAR(G)
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