MESON Chess Problem Database

Problem Display
PID: 210416 (8/p2nPP2/1b4p1/2k2b1R/PN2r3/BP2PB2/7Q/1K6 w - - 0 1)

Billington, Thomas Henry

The Observer, 1920

(First published on Sun Dec 5 1920)

8/p2nPP2/1b4p1/2k2b1R/PN2r3/BP2PB2/7Q/1K6

#2

11 + 7

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe3+
      • 2.Sc2#
    • 1...Rc4+
      • 2.Sd3#
    • 1...Rd4+
      • 2.Sd3#
    • 1...Rf4+
      • 2.Sd3#
    • 1...Rg4+
      • 2.Sd3#
    • 1...Rh4+
      • 2.Sd3#
    • 1...Re5+
      • 2.Sc2#
      • 2.Sd3#
    • 1...Re6+
      • 2.Sc2#
      • 2.Sd3#
    • 1...Rxe7+
      • 2.Sc2#
      • 2.Sd3#
    • 1...Bc7
      • 2.Qxc7#
  • Tries
    • 1.Sc2+?
      • 1...Kd5
        • 2.Qd6#
      • 1...Rb4
        • 2.Bxb4#
      • 1...Kc6!
    • 1.Sd3+?
      • 1...Kd5
        • 2.Qd6#
      • 1...Kc6!
    • 1.Sa6+?
      • 1...Kd5
        • 2.Qd6#
      • 1...Kc6!
    • 1.Qe5+?
      • 1...Rxe5+
        • 2.Sc2#
        • 2.Sd3#
      • 1...Sxe5!
    • 1.Qc2+?
      • 1...Rc4
        • 2.Sa2#
        • 2.Sd3#
        • 2.Sa6#
        • 2.Sc6#
      • 1...Kd6!
  • Keys
    • 1.e8S!
      • threat
        • 2.Qd6#
      • 1...Rxe3+
        • 2.Sc2#
      • 1...Rxb4+
        • 2.Qc2#
      • 1...Rc4+
        • 2.Sd3#
      • 1...Rd4+
        • 2.Sd3#
      • 1...Rf4+
        • 2.Sd3#
      • 1...Rg4+
        • 2.Sd3#
      • 1...Rh4+
        • 2.Sd3#
      • 1...Re5+
        • 2.Sc2#
        • 2.Sd3#
      • 1...Re6+
        • 2.Sc2#
        • 2.Sd3#
        • 2.Qc2#
      • 1...Re7+
        • 2.Sc2#
        • 2.Sd3#
        • 2.Qc2#
      • 1...Rxe8+
        • 2.Sc2#
        • 2.Sd3#
      • 1...Bc7
        • 2.Qxc7#
      • 1...Se5
        • 2.f8Q#
        • 2.f8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,N_GUARD,XP(E)::B(C)+S(H)
    • R(a);CHECK::B(C)+S(H),DCHECK
    • B(d);N_GUARD::QAR2(B),XB(d)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINR(a)::QAR1(B)
        • R(a);N_GUARD,P_PINP(D),P_PINS(H),P_SPINR(a)::B(C),XR(a)
      • Refutation
        • K(b);N_SPINB(c),P-FLIGHT,P_SPINR(a)
    • Try
      • S(H);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINR(a)::QAR1(B)
      • Refutation
        • K(b);N_SPINB(c),P-FLIGHT,P_SPINR(a)
    • Try
      • S(H);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINR(a)::QAR1(B)
      • Refutation
        • K(b);N_SPINB(c),P-FLIGHT,P_SPINR(a)
    • Try
      • Q(B);CHECK,N_PINB(c)
      • Refutation
        • S(g);XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);N_SPINB(c),S_FLIGHT
  • Actual
    • P(J);
    • Threat
      • QAB1(B)
    • Vars
      • R(a);CHECK,N_GUARD,XP(E)::B(C)+S(H)
      • R(a);CHECK,N_GUARD,P_PINP(D),P_SPINR(a),XS(H)::QAR(B)
      • R(a);CHECK::B(C)+S(H),DCHECK
      • B(d);N_GUARD::QAR2(B),XB(d)
      • S(g);N_GUARD,N_SPINB(c),S_CUTR(a)::P=Q
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