MESON Chess Problem Database

Problem Display
PID: 211139 (8/8/1p2pp2/1P3b1R/2N1k1p1/p3P1P1/Pp4p1/1K1QR1B1 w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1921

(First published on Sun Dec 18 1921)

8/8/1p2pp2/1P3b1R/2N1k1p1/p3P1P1/Pp4p1/1K1QR1B1

#2

10 + 9

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bg6
      • 2.Sd6#
    • 1...Bh7
      • 2.Sd6#
    • 1...e5
      • 2.Sd6#
  • Tries
    • 1.Rg5?
      • 1...Bg6
        • 2.Sd6#
      • 1...Bh7
        • 2.Sd6#
      • 1...e5
        • 2.Sd6#
      • 1...fxg5!
    • 1.Qc2+?
      • 1...Kd5
        • 2.e4#
      • 1...Kf3!
    • 1.Qe2?
      • 1...Kd5+
        • 2.e4#
      • 1...Bg6
        • 2.Sd2#
        • 2.Sd6#
      • 1...Bh7
        • 2.Sd2#
        • 2.Sd6#
      • 1...e5!
    • 1.Qd3+?
      • 1...Kf3
        • 2.e4#
      • 1...Kxd3!
    • 1.Qd7?
      • 1...Bg6
        • 2.Sd2#
      • 1...Bh7
        • 2.Sd2#
      • 1...e5
        • 2.Sd2#
      • 1...Kf3+!
    • 1.Qd8?
      • 1...Bg6
        • 2.Sd2#
      • 1...Bh7
        • 2.Sd2#
      • 1...e5
        • 2.Sd2#
      • 1...Kf3+!
  • Keys
    • 1.Qb3!
      • 1...Kf3+
        • 2.e4#
      • 1...Kd5+
        • 2.e4#
      • 1...Bg6
        • 2.Sd2#
      • 1...Bh7
        • 2.Sd2#
      • 1...e5
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(f);::S(H)
    • P(h);SBLOCK::S(H)
  • Tries
    • Try
      • R(J);
      • Vars
        • B(f);::S(H)
        • P(h);SBLOCK::S(H)
      • Refutation
        • P(i);XR(J)
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);OGATE,P_PINQ(B),P_SPINB(f),S_FLIGHT::P(F)
      • Refutation
        • K(d);P_PINQ(B),S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(d);CHECK,OGATE,P_SPINB(f),S_FLIGHT::P(F)
      • Refutation
        • P(h);
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);OGATE,P_PINQ(B),S_FLIGHT::QAR(B)+P(F)
      • Refutation
        • K(d);S_FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Vars
        • B(f);::S(H)
        • P(h);SBLOCK::S(H)
      • Refutation
        • K(d);CHECK,S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • B(f);::S(H)
        • P(h);SBLOCK::S(H)
      • Refutation
        • K(d);CHECK,S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(d);CHECK,OGATE,S_FLIGHT::QAR(B)+P(F)
      • K(d);CHECK,OGATE,P_SPINB(f),S_FLIGHT::P(F)
      • B(f);::S(H)
      • P(h);SBLOCK::S(H)
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