MESON Chess Problem Database

Problem Display
PID: 43399 (q3n3/r3R2r/4Bpb1/2Q1NPb1/3Pk1p1/R5P1/8/3KN3 w - - 0 1)

Ahues, Herbert Siegfried Oskar

2nd Prize, Schweizerische Arbeiter Schachzeitung, 1967

q3n3/r3R2r/4Bpb1/2Q1NPb1/3Pk1p1/R5P1/8/3KN3

#2

10 + 9

23 Die Schwalbe 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qxd5#
    • 1...Qb8
      • 2.Qd5#
    • 1...Qc8
      • 2.Qd5#
    • 1...Rb7
      • 2.Qd5#
    • 1...fxe5
      • 2.Qxe5#
  • Tries
    • 1.Sxg4?
      • threat
        • 2.Sf2#
      • 1...Rxa3
        • 2.Bf7#
      • 1...Rh2
        • 2.Bd7#
      • 1...Be3
        • 2.Rxe3#
      • 1...Bh5!
    • 1.Sc6?
      • threat
        • 2.Qc2#
        • 2.Qd5#
      • 1...Rxa3
        • 2.Bf7#
      • 1...Qd8
        • 2.Qc2#
      • 1...Ra5
        • 2.Bf7#
        • 2.Qc2#
      • 1...Rd7
        • 2.Qc2#
      • 1...Rh2
        • 2.Bd7#
        • 2.Qd5#
      • 1...Sc7
        • 2.Qc2#
      • 1...Qxc6!
    • 1.Bd5+?
      • 1...Kxf5
        • 2.Qc2#
      • 1...Qxd5!
  • Keys
    • 1.Bb3!
      • threat
        • 2.Bc2#
      • 1...Ke3
        • 2.Sxg4#
      • 1...Kxf5
        • 2.Sc6#
      • 1...Rxa3
        • 2.Sf7#
      • 1...Rh2
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(h);N_GUARD,P_PINP(E)::QAB1(F),XQ(h)
    • Q(h);N_GUARD::QAB1(F)
    • R(f);S_CUTQ(h)::QAB1(F)
    • P(d);OGATE,XS(G)::QAR1(F),XP(d)
  • Tries
    • Try
      • S(G);XP(b)
      • Threat
        • S(G)
      • Vars
        • R(f);N_GUARD,XR(C)::R(J)+B(I)
        • R(g);N_GUARD::R(J)+B(I)
        • B(c);N_GUARD::R1(C),XB(c)
      • Refutation
        • B(e);P_PINS(G)
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);N_GUARD,XR(C)::R(J)+B(I)
        • Q(h);P_PINP(E)::QAB(F)
        • R(f);P_PINP(E)::QAB(F)
        • S(i);::QAB(F)
      • Refutation
        • Q(h);XS(G)
    • Try
      • B(I);CHECK
      • Vars
        • K(a);S_FLIGHT,XP(H)::QAB(F)
      • Refutation
        • Q(h);P_PINP(E),XB(I)
  • Actual
    • B(I);
    • Threat
      • B(I)
    • Vars
      • K(a);P-FLIGHT::R(J)+S(G),DCHECK,XP(b)
      • K(a);S_FLIGHT,XP(H)::QAR(F)+S(G)
      • R(f);N_GUARD,XR(C)::R(J)+S(G)
      • R(g);N_GUARD::R(J)+S(G)
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