MESON Chess Problem Database

Problem Display
PID: 195804 (8/8/8/5Q1B/2p3nK/2P5/1pR5/nr1krN2 w - - 0 1)

Grant, Herbert W

The Observer, 1942

(First published on Sun Feb 15 1942)

8/8/8/5Q1B/2p3nK/2P5/1pR5/nr1krN2

#2

6 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rc1
      • 2.Rd2#
  • Tries
    • 1.Qxg4+?
      • 1...Re2
        • 2.Qxe2#
      • 1...Kxc2!
    • 1.Qf2?
      • threat
        • 2.Qd2#
      • 1...Re2
        • 2.Qxe2#
      • 1...Sb3!
    • 1.Qf3+?
      • 1...Re2
        • 2.Qxe2#
      • 1...Kxc2!
  • Keys
    • 1.Re2!
      • 1...Kc1
        • 2.Rxe1#
      • 1...Kxe2
        • 2.Bxg4#
      • 1...Rxf1
        • 2.Qxf1#
      • 1...Rxe2
        • 2.Qxb1#
      • 1...Rc1
        • 2.Rd2#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Sb3
        • 2.Qc2#
      • 1...Sf2
        • 2.Qxb1#
      • 1...Sh2
        • 2.Qxb1#
      • 1...Se3
        • 2.Qxb1#
      • 1...Se5
        • 2.Qxb1#
      • 1...Sf6
        • 2.Qxb1#
      • 1...Sh6
        • 2.Qxb1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • R(b);SBLOCK::R1(B)
  • Tries
    • Try
      • Q(E);CHECK,XS(g)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::QAB1(E),XR(d)
      • Refutation
        • K(c);S_FLIGHT,XR(B)
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • R(d);N_GUARD,N_SPINS(g)::QAB1(E),XR(d)
      • Refutation
        • S(a);
    • Try
      • Q(E);CHECK,N_PINS(g)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::QAB1(E),XR(d)
      • Refutation
        • K(c);S_FLIGHT,XR(B)
  • Actual
    • R(B);N_PINS(g)
    • Vars
      • K(c);P-FLIGHT::R(B),XR(d)
      • K(c);OGATEB,P_SPINS(g),S_FLIGHT,XR(B)::B(F),XS(g)
      • R(d);OGATE,XS(A)::QAR2(E),XR(d)
      • R(d);SBLOCK,XR(B)::QAR2(E),XR(b)
      • R(b);SBLOCK::R1(B)
      • S(a);N_GUARD::QAB1(E),XS(a)
      • S(a);N_GUARD::QAB1(E)
      • S(g);::QAR2(E),XR(b)
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