MESON Chess Problem Database

Problem Display
PID: 234837 (2B5/7K/8/5npk/R5pP/8/7Q/8 w - - 0 1)

Groeneveld, Cornelis

Il Due Mosse, 1954

2B5/7K/8/5npk/R5pP/8/7Q/8

#2

5 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Bxg4#
    • 1...Sxh4
      • 2.Bxg4#
    • 1...Sd6
      • 2.Bxg4#
    • 1...Se7
      • 2.Bxg4#
    • 1...Sg7
      • 2.Bxg4#
  • Tries
    • 1.Bxf5?
      • threat
        • 2.Bxg4#
        • 2.Bg6#
      • 1...g3
        • 2.Bg4#
        • 2.Bg6#
      • 1...gxh4!
    • 1.Qf4?
      • threat
        • 2.Qxg5#
        • 2.Qxg4#
      • 1...Kxh4
        • 2.Qh2#
        • 2.Qxg4#
      • 1...Sxh4
        • 2.Bxg4#
        • 2.Qxg4#
      • 1...gxh4
        • 2.Qxg4#
        • 2.Qxf5#
      • 1...Sh6
        • 2.Qxg5#
      • 1...Se3
        • 2.Qxg5#
      • 1...g3
        • 2.Qxg5#
        • 2.Qg4#
      • 1...gxf4!
    • 1.Qd6?
      • 1...Kxh4
        • 2.Qh2#
      • 1...Sxh4
        • 2.Bxg4#
        • 2.Qh6#
      • 1...gxh4
        • 2.Qg6#
      • 1...Sh6
        • 2.Qxh6#
      • 1...Se3
        • 2.Qh6#
      • 1...Sg3
        • 2.Qh6#
      • 1...Sd4
        • 2.Qh6#
      • 1...Se7
        • 2.Qh6#
      • 1...Sg7
        • 2.Qh6#
      • 1...g3
        • 2.Qg6#
      • 1...Sxd6!
  • Keys
    • 1.Qe5!
      • 1...Kxh4
        • 2.Qh2#
      • 1...Sxh4
        • 2.Bxg4#
      • 1...gxh4
        • 2.Qxf5#
      • 1...Sh6
        • 2.Qxg5#
      • 1...Se3
        • 2.Qxg5#
      • 1...Sg3
        • 2.Qxg5#
      • 1...Sd4
        • 2.Qxg5#
      • 1...Sd6
        • 2.Qxg5#
      • 1...Se7
        • 2.Qxg5#
      • 1...Sg7
        • 2.Qxg5#
      • 1...g3
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(b);OGATE::B(E),XP(a)
    • S(b);OGATE,P_SPINS(b),XP(C)::B(E),XP(a)
  • Tries
    • Try
      • B(E);XS(b)
      • Threat
        • DUALS(2)
      • Refutation
        • P(c);P_SPINP(c),XP(C)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::QAR1(A),XP(c)
      • Refutation
        • P(c);XQ(A)
    • Try
      • Q(A);
      • Vars
        • K(d);OGATEB,P-FLIGHT,P_SPINP(a),XP(C)::QAR2(A)
        • P(c);SBLOCK,XP(C)::QAB1(A)
        • S(b);N_GUARD::QAR1(A),XS(b)
        • S(b);N_GUARD::QAR1(A)
        • P(a);::QAB1(A)
      • Refutation
        • S(b);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • K(d);OGATEB,P-FLIGHT,P_SPINP(a),XP(C)::QAR2(A)
      • S(b);OGATE,P_SPINP(c),SBLOCK,XP(C)::B(E),XP(a)
      • P(c);OGATEB,P_SPINS(b),SBLOCK,XP(C)::QAR2(A),XS(b)
      • S(b);OGATE,P_SPINP(c)::QAR1(A),XP(c)
      • P(a);::QAB(A)
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