MESON Chess Problem Database

Problem Display
PID: 87777 (3R4/8/3r4/1Knk1BN1/8/4b3/3n4/Q2R4 w - - 0 1)

Segers, Marcel

The Problemist, 1991

3R4/8/3r4/1Knk1BN1/8/4b3/3n4/Q2R4

#2

6 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.Be4#
      • 2.Be6#
    • 1...Sd3
      • 2.Be6#
    • 1...Sa4
      • 2.Be4#
      • 2.Be6#
    • 1...Se4
      • 2.Bxe4#
      • 2.Be6#
    • 1...Sa6
      • 2.Be4#
      • 2.Be6#
    • 1...Se6
      • 2.Be4#
      • 2.Bxe6#
    • 1...Sb7
      • 2.Be4#
      • 2.Be6#
    • 1...Sd7
      • 2.Be4#
  • Tries
    • 1.Rxd2+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sd3
        • 2.Be4#
        • 2.Be6#
      • 1...Bxd2!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Qe5#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bf4
        • 2.Qd4#
      • 1...Sd3
        • 2.Qa8#
      • 1...Sd7
        • 2.Qa2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,N_SPINS(a)::B(D)
    • S(c);N_GUARD,N_SPINR(e)::B(D)
  • Tries
    • Try
      • R(B);CHECK,XS(a)
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(A),XB(b)
      • Refutation
        • B(b);XR(B)
  • Actual
    • S(E);
    • Threat
      • QAR1(A)
    • Vars
      • B(b);N_GUARD,N_SPINS(a)::QAR1(A),XB(b)
      • B(b);N_GUARD::QAR1(A)
      • S(c);N_GUARD,N_SPINS(a)::QAB(A)
      • S(c);N_GUARD,N_SPINR(e)::QAB(A)
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