MESON Chess Problem Database

Problem Display
PID: 41972 (nRB4r/4RN2/2k5/1p5p/3Pn2K/2Nb4/8/7Q w - - 0 1)

Grimshaw, Percy

Western Daily Mercury, 1919

(First published on Fri Jul 11 1919)

nRB4r/4RN2/2k5/1p5p/3Pn2K/2Nb4/8/7Q

#2

8 + 7

3360 Simple Two-move Themes 1924
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Qxe4#
    • 1...Be2
      • 2.Qxe4#
    • 1...Sb6
      • 2.Bb7#
    • 1...Sc7
      • 2.Bd7#
  • Tries
    • 1.Sa2?
      • threat
        • 2.Sb4#
      • 1...b4
        • 2.Sxb4#
      • 1...Kd5!
    • 1.Sd5?
      • threat
        • 2.Sb4#
        • 2.Bb7#
      • 1...Rxc8
        • 2.Sb4#
      • 1...Sc5
        • 2.Sb4#
      • 1...Sd6
        • 2.Sb4#
        • 2.Se5#
        • 2.Bd7#
      • 1...b4
        • 2.Sxb4#
      • 1...Kxd5!
    • 1.Sd8+?
      • 1...Kd6
        • 2.Rd7#
      • 1...Rxd8!
    • 1.Rxb5?
      • threat
        • 2.Bb7#
        • 2.d5#
      • 1...Rxc8
        • 2.d5#
      • 1...Rd8
        • 2.Bb7#
      • 1...Bc4
        • 2.Bb7#
      • 1...Sb6
        • 2.Bb7#
        • 2.Rc5#
      • 1...Sc7
        • 2.Bb7#
        • 2.Bd7#
      • 1...Bxb5!
    • 1.Rb6+?
      • 1...Sxb6
        • 2.Bb7#
      • 1...Kxb6!
    • 1.Rxa8?
      • threat
        • 2.Ra6#
      • 1...Kb6
        • 2.Ra6#
      • 1...b4!
    • 1.Qh3?
      • threat
        • 2.Qd7#
      • 1...Sc5
        • 2.d5#
      • 1...Sf6
        • 2.Qe6#
      • 1...Sb6
        • 2.Bb7#
      • 1...Rd8!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qxa8#
      • 1...Sc5
        • 2.d5#
      • 1...Sd6
        • 2.Se5#
      • 1...Sb6
        • 2.Bb7#
      • 1...Sc7
        • 2.Bd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::QAB(A),XS(b)
    • S(f);SBLOCK::B(H)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • P(c);::S(B),XP(c)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • S(B);N_PINS(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(g);XB(H)::S(B)
        • S(b);::QAB(A)+S(B),DCHECK
        • P(c);::S(B),XP(c)
      • Refutation
        • K(e);P_SPINS(b),S_FLIGHT,XS(B)
    • Try
      • S(F);CHECK
      • Vars
        • K(e);N_SPINS(b),P-FLIGHT::R1(E)
      • Refutation
        • R(g);XS(F)
    • Try
      • R(G);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(g);XB(H)::P(C)
        • R(g);::B(H)
        • B(a);::B(H)
      • Refutation
        • B(a);XR(G)
    • Try
      • R(G);CHECK
      • Vars
        • S(f);SBLOCK,XR(G)::B(H)
      • Refutation
        • K(e);N_SPINS(b),P-FLIGHT,XR(G)
    • Try
      • R(G);XS(f)
      • Threat
        • R(G)
      • Vars
        • K(e);N_SPINS(b),P-FLIGHT::R1(G)
      • Refutation
        • P(c);
    • Try
      • Q(A);N_PINS(b)
      • Threat
        • QAB1(A)
      • Vars
        • S(b);SBLOCK::P(C)
        • S(b);N_GUARD::QAR2(A)
        • S(f);SBLOCK::B(H)
      • Refutation
        • R(g);
  • Actual
    • Q(A);N_PINS(b)
    • Threat
      • QAB(A),XS(f)
    • Vars
      • S(b);SBLOCK::P(C)
      • S(b);SBLOCK::S(F)
      • S(f);SBLOCK::B(H)
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