MESON Chess Problem Database

Problem Display
PID: 160237 (1b2R2K/3pBkN1/rQ4p1/7N/8/8/8/8 w - - 0 1)

Sydenham, Colin Peter

Comm., Portuguese Chess Federation Meredith Ty., 1990

1b2R2K/3pBkN1/rQ4p1/7N/8/8/8/8

#2

6 + 5

15513 Selected Chess Problems of Colin Sydenham 2015
3713 Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qf6#
    • 1...Ra2
      • 2.Qf6#
    • 1...Ra3
      • 2.Qf6#
    • 1...Ra4
      • 2.Qf6#
    • 1...Ra5
      • 2.Qf6#
    • 1...Ra7
      • 2.Qf6#
    • 1...Ra8
      • 2.Qf6#
    • 1...Bd6
      • 2.Qb3#
    • 1...d6
      • 2.Qf2#
  • Tries
    • 1.Bb4?
      • threat
        • 2.Rf8#
      • 1...d6
        • 2.Qf2#
      • 1...Bd6!
    • 1.Bc5?
      • threat
        • 2.Rf8#
      • 1...Bd6
        • 2.Qb3#
      • 1...d6!
    • 1.Qf2+?
      • 1...Rf6
        • 2.Qxf6#
      • 1...Bf4!
    • 1.Qxa6?
      • threat
        • 2.Qf6#
      • 1...Bd6
        • 2.Qc4#
        • 2.Qa2#
      • 1...d6
        • 2.Qf1#
      • 1...Be5!
  • Keys
    • 1.Ba3!
      • threat
        • 2.Rf8#
      • 1...Rxa3
        • 2.Qf6#
      • 1...Bd6
        • 2.Qb3#
      • 1...d6
        • 2.Qf2#

Anticipated by 179105(1934)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • R(a);N_GUARD::QAR1(B)
    • B(e);S_CUTP(c),S_CUTR(a)::QAB(B)
    • P(c);S_CUTB(e),S_CUTR(a)::QAR(B)
  • Tries
    • Try
      • B(C);
      • Threat
        • R1(E)
      • Vars
        • P(c);S_CUTB(e),S_CUTR(a)::QAR(B)
      • Refutation
        • B(e);
    • Try
      • B(C);
      • Threat
        • R1(E)
      • Vars
        • B(e);S_CUTP(c),S_CUTR(a)::QAB(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(B),XR(a)
      • Refutation
        • B(e);P_SPINB(e)
    • Try
      • Q(B);XR(a)
      • Threat
        • QAR1(B)
      • Vars
        • P(c);S_CUTB(e)::QAR(B)
      • Refutation
        • B(e);P_PINS(D)
  • Actual
    • B(C);
    • Threat
      • R1(E)
    • Vars
      • R(a);N_GUARD,XB(C)::QAR1(B)
      • B(e);S_CUTP(c),S_CUTR(a)::QAB(B)
      • P(c);S_CUTB(e),S_CUTR(a)::QAR(B)
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