MESON Chess Problem Database

Problem Display
PID: 187289 (2R5/3p4/1P2p3/1P1kP3/K1Nq4/4pN2/Q2P4/1B1R4 w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1935

(First published on Sun Feb 3 1935)

2R5/3p4/1P2p3/1P1kP3/K1Nq4/4pN2/Q2P4/1B1R4

#2

11 + 5

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sxe3#
    • 1...Qb2
      • 2.Sxb2#
      • 2.Sxe3#
    • 1...Qc3
      • 2.Sxe3#
      • 2.dxc3#
    • 1...Qc5
      • 2.Sxe3#
    • 1...Qxb6
      • 2.Sb2#
      • 2.Sa3#
      • 2.Sxe3#
      • 2.Sa5#
      • 2.Sxb6#
      • 2.Sd6#
    • 1...Qxd2
      • 2.Sb2#
      • 2.Scxd2#
      • 2.Sa3#
      • 2.Sxe3#
      • 2.Sa5#
      • 2.Sd6#
    • 1...Qxc4+
      • 2.Qxc4#
  • Tries
    • 1.Rc5+?
      • 1...Qxc5
        • 2.Sxe3#
      • 1...Kxc5!
    • 1.Qa3?
      • threat
        • 2.Qd6#
      • 1...Qxe5
        • 2.Rc5#
        • 2.Qc5#
      • 1...Qxb6
        • 2.Sxb6#
      • 1...Qc5
        • 2.Rxc5#
        • 2.Qxc5#
      • 1...Qd3
        • 2.Qxd3#
      • 1...Qa1
        • 2.Sxe3#
        • 2.Rc5#
      • 1...d6
        • 2.Qxd6#
      • 1...Qxc4+!
    • 1.dxe3?
      • threat
        • 2.Rxd4#
        • 2.e4#
      • 1...Qd3
        • 2.Sd6#
      • 1...Qd2
        • 2.Sb2#
        • 2.Scxd2#
        • 2.Sa3#
        • 2.Sa5#
        • 2.Sd6#
        • 2.Rxd2#
        • 2.Qxd2#
        • 2.e4#
      • 1...Qxd1+!
  • Keys
    • 1.Kb4!
      • threat
        • 2.Qa8#
      • 1...Qb2+
        • 2.Sxb2#
      • 1...Qc3+
        • 2.dxc3#
      • 1...Qc5+
        • 2.Rxc5#
      • 1...Qxd2+
        • 2.Scxd2#
      • 1...Qxc4+
        • 2.Qxc4#
      • 1...Qxb6
        • 2.Sb2#
        • 2.Sa3#
        • 2.Sxe3#
        • 2.Sa5#
        • 2.Sxb6#
        • 2.Sd6#
      • 1...Qa1
        • 2.Sxe3#
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_PINS(G),P_PINQ(C)::QAB(C)+S(G),DCHECK,XP(a)
    • Q(b);N_PINS(G)::QAB(C)+S(G),DCHECK,XP(a)
    • Q(b);CHECK,OGATE,P_SPINQ(b),XS(G)::QAB1(C),XQ(b)
  • Tries
    • Try
      • R(K);CHECK
      • Vars
        • Q(b);N_PINS(G),SBLOCK,XR(K)::QAB(C)+S(G),DCHECK,XP(a)
      • Refutation
        • K(c);P-FLIGHT,XR(K)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • Q(b);N_PINS(G),XP(J)::S(G),XQ(b)
        • Q(b);N_PINS(G),OGATEB::QAR2(C),XQ(b)
        • P(e);::QAR1(C),XP(e)
      • Refutation
        • Q(b);CHECK,XS(G)
    • Try
      • P(D);P_PINQ(b),XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);N_PINS(G)::QAB(C)+S(G)
      • Refutation
        • Q(b);CHECK,N_PINS(G),N_SPINQ(b),XR(B)
  • Actual
    • K(F);P-FLIGHT
    • Threat
      • QAB(C)
    • Vars
      • Q(b);CHECK,N_PINS(G)::QAB(C)+S(G),XQ(b)
      • Q(b);CHECK,N_PINS(G),OGATE::R(B)+P(D),XQ(b)
      • Q(b);CHECK,N_GUARD,N_PINS(G)::R1(K),XQ(b)
      • Q(b);CHECK,N_PINS(G),P_SPINQ(b),XP(D)::QAB(C)+S(G),XQ(b)
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(G)::QAB1(C),XQ(b)
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