MESON Chess Problem Database

Problem Display
PID: 184466 (6nb/5prb/7q/5B2/1R2P1p1/p1N3p1/p1kP2R1/K4Q2 w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1928

(First published on Sun Nov 4 1928)

6nb/5prb/7q/5B2/1R2P1p1/p1N3p1/p1kP2R1/K4Q2

#2

8 + 11

15239 Valois Notebooks 2018
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rg6
      • 2.e5#
  • Tries
    • 1.Sxa2?
      • threat
        • 2.Qb1#
      • 1...Qf6+
        • 2.d4#
      • 1...Rg5+
        • 2.d4#
      • 1...Rg6+
        • 2.e5#
      • 1...Qh1!
    • 1.Sb5?
      • threat
        • 2.Sxa3#
        • 2.Sd4#
      • 1...Qf6+
        • 2.d4#
      • 1...Rg5+
        • 2.d4#
      • 1...Rg6+
        • 2.e5#
      • 1...Qe3
        • 2.dxe3#
      • 1...Qa6
        • 2.Sd4#
        • 2.d3#
        • 2.d4#
      • 1...Qb6
        • 2.Sxa3#
        • 2.d4#
      • 1...Qd6
        • 2.Sxa3#
        • 2.d3#
        • 2.d4#
      • 1...Qxd2!
    • 1.Qd3+?
      • 1...Kc1
        • 2.Rg1#
      • 1...Kxd3!
    • 1.d4+?
      • 1...Kxc3
        • 2.Qc4#
      • 1...Qd2!
  • Keys
    • 1.Sb1!
      • threat
        • 2.Sxa3#
      • 1...Qf6+
        • 2.d4#
      • 1...Rg5+
        • 2.d4#
      • 1...Rg6+
        • 2.e5#
      • 1...axb1Q+
        • 2.Qxb1#
      • 1...axb1R+
        • 2.Qxb1#
      • 1...Qxd2
        • 2.Rxd2#
      • 1...axb1S
        • 2.Qxb1#
      • 1...axb1B
        • 2.Qxb1#
      • 1...Qe3
        • 2.dxe3#
      • 1...Qa6
        • 2.d3#

Anticipated by 198719(1921)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • R(h);P_PINS(E),S_CUTB(i)::B(H)+P(G)
  • Tries
    • Try
      • S(E);XP(a)
      • Threat
        • QAB1(B)
      • Vars
        • Q(f);CHECK,N_GUARD::R(D)+P(C)
        • R(h);CHECK,S_CUTQ(f)::R(D)+P(C)
        • R(h);CHECK,S_CUTB(i)::B(H)+P(G)
      • Refutation
        • Q(f);P_PINQ(B)
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • Q(f);CHECK,N_GUARD::R(D)+P(C)
        • R(h);CHECK,S_CUTQ(f)::R(D)+P(C)
        • R(h);CHECK,S_CUTB(i)::B(H)+P(G)
        • Q(f);OGATE::R(D)+P(C),XQ(f)
      • Refutation
        • Q(f);P_SPINQ(f),XP(C)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::R(D)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • P(C);CHECK
      • Vars
        • K(b);P-FLIGHT,XS(E)::QAR1(B)
      • Refutation
        • Q(f);P_SPINQ(f)
  • Actual
    • S(E);
    • Threat
      • S(E),XP(c)
    • Vars
      • Q(f);CHECK,N_GUARD::R(D)+P(C)
      • R(h);CHECK,S_CUTQ(f)::R(D)+P(C)
      • R(h);CHECK,S_CUTB(i)::B(H)+P(G)
      • P(a);CHECK,OGATE,XS(E)::QAB1(B),XQ(a)
      • P(a);CHECK,OGATE,XS(E)::QAB1(B),XR(a)
      • Q(f);OGATE,P_SPINQ(f),XP(C)::R1(D),XQ(f)
      • P(a);OGATE,XS(E)::QAB1(B),XS(a)
      • P(a);OGATE,XS(E)::QAB1(B),XB(a)
      • Q(f);OGATE::R(D)+P(C),XQ(f)
      • Q(f);N_GUARD::R(D)+P(C)
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