MESON Chess Problem Database

Problem Display
PID: 245277 (4b3/7B/2NpP1q1/K1BQ4/4Pk1P/5NRR/3p3P/2brr1n1 w - - 0 1)

Onkoud, Abdelaziz

Hlas l'udu, 1994

(First published on Thu Dec 8 1994)

4b3/7B/2NpP1q1/K1BQ4/4Pk1P/5NRR/3p3P/2brr1n1

#2

12 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Qg5#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Qf7
      • 2.Qg5#
      • 2.Qxd6#
    • 1...Qxg3
      • 2.Qf5#
    • 1...Qg4
      • 2.Qxd6#
    • 1...Qg5
      • 2.Qxg5#
    • 1...Qxe6
      • 2.Qg5#
    • 1...Qh6
      • 2.Qf5#
      • 2.Qxd6#
    • 1...Qg7
      • 2.Qf5#
    • 1...Qg8
      • 2.Qf5#
      • 2.Qxd6#
    • 1...Re3
      • 2.Bxd6#
  • Tries
    • 1.Bxg6?
      • threat
        • 2.Qf5#
        • 2.Qg5#
        • 2.Qxd6#
      • 1...Rxe4
        • 2.Qxe4#
        • 2.Qf5#
        • 2.Qg5#
      • 1...Sxf3
        • 2.Qf5#
      • 1...Sxh3
        • 2.Qf5#
        • 2.Qxd6#
      • 1...dxc5
        • 2.Qg5#
      • 1...Bb2
        • 2.Qf5#
        • 2.Qg5#
      • 1...Bxg6!
    • 1.Rg4+?
      • 1...Qxg4
        • 2.Qxd6#
      • 1...Kxg4!
  • Keys
    • 1.Sfe5!
      • threat
        • 2.Sd3#
      • 1...Qxe4
        • 2.Rg4#
      • 1...Qxg3
        • 2.hxg3#
      • 1...dxe5
        • 2.Qxe5#
      • 1...Re3
        • 2.Bxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(h);N_GUARD,XP(E)::QAB1(I)
    • Q(h);N_GUARD::QAR1(I),XQ(h)
    • Q(h);N_GUARD,XR(C)::QAR1(I)
    • Q(h);::QAB(I),XP(g)
    • Q(h);N_GUARD::QAB1(I),XQ(h)
    • Q(h);N_GUARD,XP(K)::QAB1(I)
    • Q(h);N_GUARD::QAR1(I)
    • R(c);SBLOCK::B(H),XP(g)
  • Tries
    • Try
      • B(L);XQ(h)
      • Threat
        • DUALS(3)
      • Vars
        • S(d);XS(B)::QAR1(I)
        • P(g);XB(H)::QAB1(I)
      • Refutation
        • B(i);XB(L)
    • Try
      • R(C);CHECK
      • Vars
        • Q(h);SBLOCK,XR(C)::QAB(I),XP(g)
      • Refutation
        • K(f);P-FLIGHT,XR(C)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • Q(h);N_GUARD,XP(E)::R1(C)
      • Q(h);OGATE,XR(C)::P(A),XQ(h)
      • P(g);OGATE,XS(B)::QAB1(I),XP(g)
      • R(c);N_GUARD::B(H),XR(c)
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