MESON Chess Problem Database

Problem Display
PID: 272998 (1r2k3/pN2q2n/K4p1N/8/3Q4/B7/8/4R3 w - - 0 1)

Haring, Jacobus

Schakend Nederland, 1974

1r2k3/pN2q2n/K4p1N/8/3Q4/B7/8/4R3

#2

6 + 6

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe1
      • 2.Qa4#
    • 1...Qe2+
      • 2.Rxe2#
    • 1...Qe3
      • 2.Rxe3#
      • 2.Qa4#
    • 1...Qe4
      • 2.Rxe4#
      • 2.Qa4#
    • 1...Qe5
      • 2.Qa4#
    • 1...Qe6+
      • 2.Rxe6#
    • 1...Rd8
      • 2.Qxd8#
    • 1...Sf8
      • 2.Rxe7#
  • Tries
    • 1.Bxe7?
      • threat
        • 2.Ba3#
        • 2.Bb4#
        • 2.Bc5#
        • 2.Qa4#
      • 1...Rxb7
        • 2.Qd8#
      • 1...Rc8
        • 2.Ba3#
        • 2.Bb4#
        • 2.Bc5#
      • 1...Rd8
        • 2.Ba3#
        • 2.Bb4#
        • 2.Bc5#
        • 2.Qxd8#
      • 1...Sg5
        • 2.Qa4#
      • 1...Sf8!
    • 1.Qd6?
      • threat
        • 2.Qxe7#
      • 1...Qe2+
        • 2.Rxe2#
      • 1...Kf8
        • 2.Qxe7#
      • 1...Qxe1
        • 2.Qc6#
      • 1...Qe3
        • 2.Rxe3#
        • 2.Qc6#
      • 1...Qe4
        • 2.Rxe4#
        • 2.Qc6#
      • 1...Qe5
        • 2.Qc6#
      • 1...Qe6
        • 2.Rxe6#
        • 2.Qc6#
        • 2.Qxe6#
      • 1...Rxb7!
    • 1.Qd7+?
      • 1...Kf8
        • 2.Qxe7#
      • 1...Kxd7!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qxe7#
      • 1...Qe2+
        • 2.Qb5#
      • 1...Qe6+
        • 2.Qc6#
      • 1...Kd7
        • 2.Rxe7#
      • 1...Kf8
        • 2.Qxe7#
      • 1...Qxe1
        • 2.Qb5#
        • 2.Qc6#
      • 1...Rxb7
        • 2.Qc8#
      • 1...Qe3
        • 2.Qb5#
        • 2.Qc6#
      • 1...Qe4
        • 2.Qb5#
        • 2.Qc6#
      • 1...Qe5
        • 2.Qb5#
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_SPINQ(c),XR(A)::QAB(C)
    • Q(c);CHECK,OGATEB::R(A),XQ(c)
    • Q(c);::QAB(C)
    • R(e);N_GUARD::QAR1(C),XR(e)
    • S(d);SBLOCK::R1(A),XQ(c)
  • Tries
    • Try
      • B(B);XQ(c)
      • Threat
        • DUALS(4)
      • Vars
        • R(e);N_GUARD,XS(F)::QAR1(C)
        • S(d);::QAB(C)
      • Refutation
        • S(d);
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XQ(c)
      • Vars
        • Q(c);CHECK,OGATEB::R(A),XQ(c)
        • K(f);P-FLIGHT::QAB1(C),XQ(c)
        • Q(c);N_SPINQ(c),XR(A)::QAB(C)
        • Q(c);::QAB(C)
      • Refutation
        • R(e);XS(F)
    • Try
      • Q(C);CHECK
      • Vars
        • K(f);P-FLIGHT::QAB1(C),XQ(c)
      • Refutation
        • K(f);N_SPINQ(c),S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XQ(c)
    • Vars
      • Q(c);CHECK::QAB(C)
      • K(f);N_GUARD,N_SPINQ(c),S_FLIGHT::R1(A),XQ(c)
      • K(f);P-FLIGHT::QAB1(C),XQ(c)
      • R(e);N_GUARD,XS(F)::QAR2(C)
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