MESON Chess Problem Database

Problem Display
PID: 187835 (Q7/4pBB1/r3nN1K/1p1N4/1Pk2n1R/2P5/2P5/2b5 w - - 0 1)

George, R

The Observer, 1936

(First published on Sun Apr 19 1936)

Q7/4pBB1/r3nN1K/1p1N4/1Pk2n1R/2P5/2P5/2b5

#2

10 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Qxa2#
    • 1...Rb6
      • 2.Qa2#
    • 1...Rc6
      • 2.Qa2#
    • 1...Rd6
      • 2.Qa2#
  • Tries
    • 1.Qc6+?
      • 1...Sc5
        • 2.Qxc5#
      • 1...Rxc6!
  • Keys
    • 1.Se4!
      • 1...Se2+
        • 2.Sd2#
      • 1...Sg2+
        • 2.Sd2#
      • 1...Sd3+
        • 2.Sd2#
      • 1...Sh3+
        • 2.Sd2#
      • 1...Sxd5+
        • 2.Sd2#
      • 1...Sh5+
        • 2.Sd2#
      • 1...Sg6+
        • 2.Sd2#
      • 1...Sd4+
        • 2.Sb6#
      • 1...Sc5+
        • 2.Sb6#
      • 1...Sg5+
        • 2.Sb6#
      • 1...Sc7+
        • 2.Sb6#
      • 1...Sxg7+
        • 2.Sb6#
      • 1...Sd8+
        • 2.Sb6#
      • 1...Sf8+
        • 2.Sb6#
      • 1...Rxa8
        • 2.Sb6#
      • 1...Rc6
        • 2.Qa2#
      • 1...Ra1
        • 2.Sb6#
      • 1...Ra2
        • 2.Sb6#
        • 2.Qxa2#
      • 1...Ra3
        • 2.Sb6#
      • 1...Ra4
        • 2.Sb6#
      • 1...Ra5
        • 2.Sb6#
      • 1...Rb6
        • 2.Sxb6#
        • 2.Qa2#
      • 1...Rd6
        • 2.Qa2#
      • 1...Ra7
        • 2.Sb6#
      • 1...Bb2
        • 2.Sd2#
        • 2.Se3#
      • 1...Bd2
        • 2.Sxd2#
      • 1...Ba3
        • 2.Sd2#
        • 2.Se3#
      • 1...Be3
        • 2.Sxe3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 22
    • REMOVED MATES = 2
  • Sets
    • R(e);OGATE::QAB(J),XR(e)
    • R(e);OGATE::QAB(J)
  • Tries
    • Try
      • Q(J);CHECK
      • Vars
        • S(f);N_GUARD::QAR1(J),XS(f)
      • Refutation
        • R(e);XQ(J)
  • Actual
    • S(F);N_PINS(c)
    • Vars
      • S(c);CHECK::R(D)+S(F),DCHECK
      • S(c);CHECK,XS(E)::R(D)+S(F),DCHECK
      • S(f);CHECK::B(H)+S(E),DCHECK
      • S(f);CHECK,XB(I)::B(H)+S(E),DCHECK
      • R(e);N_GUARD,XQ(J)::S(E)
      • R(e);OGATE::QAB(J)
      • R(e);N_GUARD::S(E)
      • B(a);N_GUARD::S(F),XB(a)
      • B(a);N_GUARD::S(E),XB(a)
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