MESON Chess Problem Database

Problem Display
PID: 21039 (5n2/p1r5/2kPpN2/K2R4/3P4/8/8/7Q w - - 0 1)

Anderson, Gerald Frank

Natal Mercury, 1915

(First published on Sat Jan 9 1915)

5n2/p1r5/2kPpN2/K2R4/3P4/8/8/7Q

#2

6 + 5

2740 Adventures of my Chessmen 1924
14868 Pirnie Collection 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rb7
      • 2.Qc1#
    • 1...exd5
      • 2.Qxd5#
  • Tries
    • 1.Ka6?
      • threat
        • 2.Qc1#
      • 1...exd5
        • 2.Qxd5#
      • 1...Sd7!
    • 1.Qb1?
      • threat
        • 2.Qb5#
      • 1...Rb7
        • 2.Qc2#
        • 2.Qc1#
      • 1...a6
        • 2.Qb6#
      • 1...exd5!
    • 1.Qf1?
      • threat
        • 2.Qb5#
        • 2.Qa6#
      • 1...exd5
        • 2.Qa6#
      • 1...Rb7
        • 2.Qc4#
        • 2.Qc1#
      • 1...Sd7
        • 2.Qb5#
      • 1...a6
        • 2.Qxa6#
      • 1...Kb7!
  • Keys
    • 1.d7!
      • threat
        • 2.d8S#
      • 1...Kb7
        • 2.Rb5#
      • 1...Rxd7
        • 2.Rxd7#
      • 1...Sxd7
        • 2.Rxd7#
      • 1...exd5
        • 2.Qxd5#
      • 1...Rc8
        • 2.dxc8Q#
      • 1...Rb7
        • 2.Qc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(d);SBLOCK::QAR(A)
    • P(b);OGATE,P_SPINP(b),XR(D)::QAB1(A),XP(b)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • QAR(A)
      • Vars
        • P(b);OGATE,P_SPINP(b),XR(D)::QAB1(A),XP(b)
      • Refutation
        • S(e);
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);N_GUARD::QAR1(A)
      • Refutation
        • P(b);XR(D)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);XR(D)::QAR2(A)
        • S(e);::QAB1(A)
        • P(c);::QAR2(A),XP(c)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • P(E);
    • Threat
      • P=S
    • Vars
      • K(a);S_FLIGHT::QAB(A)+R(D),DCHECK
      • R(d);OGATE,XP(E)::QAB(A)+R(D),XR(d)
      • S(e);OGATE,XP(E)::QAB(A)+R(D),XS(e)
      • P(b);OGATE,P_SPINP(b),XR(D)::QAB1(A),XP(b)
      • R(d);OGATE::PXR(d)=Q
      • R(d);SBLOCK::QAR(A)
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