MESON Chess Problem Database

Problem Display
PID: 141766 (2R4B/bK1N1r2/1pP1P1p1/1p6/1NkP2BR/Pp1p2p1/1P2p3/5rQ1 w - - 0 1)

van Ommeren, Aegidius Samuel

5th Comm., Probleemblad, 1961

2R4B/bK1N1r2/1pP1P1p1/1p6/1NkP2BR/Pp1p2p1/1P2p3/5rQ1

#2

13 + 11

102 Probleemblad 1977

SOLUTION

  • SOUND
  • Sets
    • 1...Rc1
      • 2.Qxc1#
    • 1...R1f2
      • 2.Qc1#
    • 1...R1f3
      • 2.Qc1#
    • 1...R1f4
      • 2.Qc1#
    • 1...R1f5
      • 2.Qc1#
    • 1...R7f3
      • 2.Se5#
    • 1...R7f4
      • 2.Se5#
    • 1...Rf6
      • 2.Se5#
    • 1...Rxd7+
      • 2.cxd7#
    • 1...Rf8
      • 2.Se5#
    • 1...d2
      • 2.Bxe2#
  • Tries
    • 1.Bf3?
      • threat
        • 2.Bd5#
      • 1...Rxd7+
        • 2.cxd7#
      • 1...R1xf3
        • 2.Qc1#
      • 1...R7xf3
        • 2.Se5#
      • 1...Rf5!
  • Keys
    • 1.d5!
      • threat
        • 2.Qd4#
      • 1...Rxd7+
        • 2.cxd7#
      • 1...Rxg1
        • 2.Bf5#
      • 1...R1f2
        • 2.Qc1#
      • 1...R1f4
        • 2.Qc1#
      • 1...R1f6
        • 2.Bf5#
      • 1...R7f2
        • 2.Bf3#
      • 1...R7f4
        • 2.Se5#
      • 1...R7f6
        • 2.Se5#
      • 1...Rg7
        • 2.Bf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • R(a);OGATE::QAR(A),XR(a)
    • R(a);OGATE::QAR(A)
    • R(k);N_PINS(K)::S(K)
    • R(k);CHECK,OGATE,XS(K)::R(L)+P(H),XR(k)
    • P(d);OGATEB::B(F),XP(b)
  • Tries
    • Try
      • B(F);
      • Threat
        • B(F)
      • Vars
        • R(k);CHECK,OGATE,XS(K)::R(L)+P(H),XR(k)
        • R(a);OGATE,XB(F)::QAR(A)
        • R(k);N_PINS(K),XB(F)::S(K)
      • Refutation
        • R(k);N_PINS(K)
  • Actual
    • P(E);
    • Threat
      • QAR1(A)
    • Vars
      • R(k);CHECK,OGATE,XS(K)::R(L)+P(H),XR(k)
      • R(a);N_GUARD,XQ(A)::R(G)+B(F)
      • R(a);OGATE::QAR(A)
      • R(a);N_GUARD::R(G)+B(F)
      • R(k);N_GUARD,N_PINS(K)::R(G)+B(F)
      • R(k);N_PINS(K)::S(K)
      • R(k);N_GUARD::R(G)+B(F)
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