MESON Chess Problem Database

Problem Display
PID: 247678 (1K4B1/ppn5/q5R1/4P2p/4k2p/5R2/6r1/B2Q3N w - - 0 1)

Macleod, Norman Alasdair

The Problemist, 1990

1K4B1/ppn5/q5R1/4P2p/4k2p/5R2/6r1/B2Q3N

#2

8 + 8

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Qxd3#
    • 1...Qa2
      • 2.Qd3#
    • 1...Qa4
      • 2.Qd3#
    • 1...Qa5
      • 2.Qd3#
    • 1...Qb6
      • 2.Qd3#
    • 1...Qc6
      • 2.Qd3#
    • 1...Qe6
      • 2.Qd3#
    • 1...Qf6
      • 2.Qd3#
    • 1...Qxg6
      • 2.Qd3#
    • 1...Rg1
      • 2.Sf2#
    • 1...Rf2
      • 2.Sxf2#
    • 1...Rg3
      • 2.Sf2#
    • 1...Rg4
      • 2.Sf2#
    • 1...Rg5
      • 2.Sf2#
    • 1...Rxg6
      • 2.Sf2#
    • 1...Sb5
      • 2.Bd5#
      • 2.Qd3#
      • 2.Qd5#
    • 1...Sd5
      • 2.Bxd5#
      • 2.Qxd5#
    • 1...Sa8
      • 2.Bd5#
      • 2.Qd5#
    • 1...Se8
      • 2.Bd5#
      • 2.Qd5#
    • 1...b5
      • 2.Qd3#
  • Tries
    • 1.Rxg2?
      • threat
        • 2.Sf2#
      • 1...Qe2
        • 2.Qxe2#
      • 1...Qf1
        • 2.Bh7#
      • 1...Qa2
        • 2.Bh7#
        • 2.Qd3#
      • 1...Qb6
        • 2.Qd3#
      • 1...Qxa1!
    • 1.Rg4+?
      • 1...Rxg4
        • 2.Sf2#
      • 1...hxg4!
  • Keys
    • 1.Bh7!
      • threat
        • 2.Rg4#
      • 1...Qxa1
        • 2.Rg5#
      • 1...Qxg6
        • 2.Qd3#
      • 1...Rxg6
        • 2.Sf2#
      • 1...Qe2
        • 2.Rgg3#
      • 1...Qd3
        • 2.Qxd3#
      • 1...Rb2
        • 2.Re6#
      • 1...Rd2
        • 2.Rd6#
      • 1...Re2
        • 2.Rgf6#
      • 1...Rg4
        • 2.Sf2#
        • 2.Rxg4#
      • 1...Rg5
        • 2.Sf2#

Anticipated by 176489(1980)

This is after 6774

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 12
  • Sets
    • Q(e);N_GUARD::QAB1(B),XQ(e)
    • Q(e);N_GUARD::QAB1(B)
    • Q(e);N_GUARD,XR(F)::QAB1(B)
    • R(a);N_GUARD::S(C)
    • R(a);N_GUARD::S(C),XR(a)
    • R(a);N_GUARD,XR(F)::S(C)
    • P(g);S_CUTQ(e)::QAB1(B)
  • Tries
    • Try
      • R(F);XR(a)
      • Threat
        • S(C)
      • Vars
        • Q(e);N_GUARD::QAR2(B),XQ(e)
        • Q(e);N_GUARD::B(H)
        • Q(e);N_GUARD::QAB1(B)
      • Refutation
        • Q(e);XB(A)
    • Try
      • R(F);CHECK
      • Vars
        • R(a);XR(F)::S(C)
      • Refutation
        • P(d);XR(F)
  • Actual
    • B(H);
    • Threat
      • B(H)+R(F),DCHECK
    • Vars
      • Q(e);N_GUARD,XB(A)::B(H)+R(F)
      • Q(e);N_GUARD,P_SPINQ(e),XR(F)::QAB1(B)
      • R(a);N_GUARD,P_SPINR(a),XR(F)::S(C)
      • Q(e);N_GUARD::B(H)+R(F)
      • Q(e);N_GUARD::QAB1(B),XQ(e)
      • R(a);N_GUARD::B(H)+R(F)
      • R(a);N_GUARD::S(C)
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