MESON Chess Problem Database

Problem Display
PID: 109093 (3k4/3P2N1/3KP3/3p3n/3r4/8/4r1p1/6Q1 w - - 0 1)

Oncescu, Nicolae

Bucharest Cup, 1988

3k4/3P2N1/3KP3/3p3n/3r4/8/4r1p1/6Q1

#2

5 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.e7#
    • 1...Rb2
      • 2.e7#
    • 1...Rc2
      • 2.e7#
    • 1...Red2
      • 2.e7#
    • 1...Rf2
      • 2.e7#
    • 1...Rxe6+
      • 2.Sxe6#
    • 1...Rd1
      • 2.Qb6#
    • 1...Rdd2
      • 2.Qb6#
    • 1...Rd3
      • 2.Qb6#
    • 1...Ra4
      • 2.Qb6#
    • 1...Re4
      • 2.Qb6#
    • 1...Rf4
      • 2.Qb6#
    • 1...Rg4
      • 2.Qb6#
    • 1...Rh4
      • 2.Qb6#
  • Tries
    • 1.Qe3?
      • threat
        • 2.e7#
      • 1...Re4
        • 2.Qb6#
      • 1...Rxe3!
    • 1.Qc1?
      • threat
        • 2.Qc7#
        • 2.Qc8#
      • 1...Rxe6+
        • 2.Sxe6#
      • 1...Rc2
        • 2.e7#
      • 1...Rc4!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qf8#
      • 1...Rxe6+
        • 2.Sxe6#
      • 1...Rxf2
        • 2.e7#
      • 1...Sxg7
        • 2.Qf6#
      • 1...Rf4
        • 2.Qb6#
      • 1...Sf4
        • 2.Qh4#
      • 1...Sf6
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • R(a);N_GUARD::P(C)
    • R(a);CHECK,XP(C)::S(E),XR(a)
    • R(c);OGATE::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • P(C)
      • Vars
        • R(c);OGATE::QAB(A)
      • Refutation
        • R(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);CHECK,XP(C)::S(E),XR(a)
        • R(a);N_GUARD::P(C)
      • Refutation
        • R(c);
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • R(a);CHECK,XP(C)::S(E),XR(a)
      • R(a);N_GUARD,XQ(A)::P(C)
      • S(e);N_GUARD,XS(E)::QAB(A)
      • R(c);OGATE::QAB(A)
      • S(e);N_GUARD,S_CUTR(c)::QAB(A)
      • S(e);N_GUARD::QAB(A),XS(e)
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