MESON Chess Problem Database

Problem Display
PID: 157301 (KnNr4/b3p3/8/1pk1P1RQ/1p1RB3/8/3r4/4N1B1 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Tidskrift for Schack, 1955

KnNr4/b3p3/8/1pk1P1RQ/1p1RB3/8/3r4/4N1B1

#2

9 + 8

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Sd3#
    • 1...Rb2
      • 2.Sd3#
    • 1...Rc2
      • 2.Sd3#
    • 1...Re2
      • 2.Sd3#
    • 1...Rg2
      • 2.Sd3#
    • 1...Rh2
      • 2.Sd3#
    • 1...Rd3
      • 2.Sxd3#
    • 1...Re8
      • 2.e6#
    • 1...Rh8
      • 2.e6#
  • Tries
    • 1.Rxd2+?
      • 1...Rd4
        • 2.Rc2#
      • 1...Kc4!
    • 1.Qf7?
      • threat
        • 2.Rc4#
      • 1...R2xd4
        • 2.Sd3#
      • 1...R8xd4
        • 2.Qd5#
      • 1...Rd5
        • 2.Qxd5#
      • 1...e6
        • 2.Qxa7#
      • 1...Rf2!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Rc4#
      • 1...Rxe2
        • 2.Sd3#
      • 1...R2xd4
        • 2.Qc2#
      • 1...R8xd4
        • 2.e6#
      • 1...Rd3
        • 2.Sxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD::S(A)
    • R(a);N_GUARD::S(A),XR(a)
    • R(h);N_GUARD::R(F)+P(E)
  • Tries
    • Try
      • R(C);CHECK,XR(a)
      • Vars
        • R(h);P_SPINR(h)::R(C)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(G);
      • Threat
        • B(B)+R(C),DCHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a),XR(C)::S(A)
        • R(h);N_GUARD,P_SPINR(h),XR(C)::QAR1(G)
        • R(h);N_GUARD::QAR1(G),XR(h)
        • P(f);OGATE::QAB(G),XB(e)
      • Refutation
        • R(a);
  • Actual
    • Q(G);
    • Threat
      • B(B)+R(C),DCHECK
    • Vars
      • R(a);N_GUARD,XQ(G)::S(A)
      • R(a);OGATE,P_SPINR(a),XR(C)::QAR(G)
      • R(h);N_GUARD,P_SPINR(h),XR(C)::R(F)+P(E)
      • R(a);N_GUARD::S(A),XR(a)
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