MESON Chess Problem Database

Problem Display
PID: 202806 (B6B/2p3n1/r3n2Q/1RN1bp2/2Nk4/pP3qp1/2PP4/2KbR3 w - - 0 1)

Daniel, Arthur William

The Observer, 1950

(First published on Sun Nov 26 1950)

B6B/2p3n1/r3n2Q/1RN1bp2/2Nk4/pP3qp1/2PP4/2KbR3

#2

11 + 11

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Qe3#
      • 2.c3#
    • 1...Qe2
      • 2.c3#
    • 1...Qg2
      • 2.Qe3#
      • 2.c3#
    • 1...Qe4
      • 2.c3#
    • 1...Qg4
      • 2.Qe3#
      • 2.c3#
    • 1...Qd5
      • 2.Qe3#
      • 2.c3#
    • 1...Qh5
      • 2.Qe3#
      • 2.c3#
    • 1...Qf1
      • 2.Qe3#
      • 2.c3#
    • 1...Qf2
      • 2.c3#
    • 1...Qe3
      • 2.Qxe3#
    • 1...Qf4
      • 2.c3#
    • 1...Bd6
      • 2.Sxe6#
    • 1...Bf6
      • 2.Qxf6#
    • 1...Sh5
      • 2.Bxe5#
    • 1...Se8
      • 2.Bxe5#
  • Tries
    • 1.Sxe6+?
      • 1...Sxe6
        • 2.Bxe5#
      • 1...Rxe6!
    • 1.Bxf3?
      • threat
        • 2.Qe3#
        • 2.c3#
      • 1...Bxc2
        • 2.Qe3#
      • 1...Sxc5
        • 2.Qe3#
      • 1...Bf4
        • 2.c3#
      • 1...Sf4
        • 2.c3#
      • 1...Sg5
        • 2.c3#
      • 1...f4
        • 2.c3#
      • 1...Bxf3!
    • 1.Re4+?
      • 1...Qxe4
        • 2.c3#
      • 1...fxe4!
  • Keys
    • 1.Se3!
      • threat
        • 2.c3#
      • 1...Qxe3
        • 2.Qxe3#
      • 1...Bxc2
        • 2.Sxc2#
      • 1...Sxc5
        • 2.Rb4#
      • 1...Bf4
        • 2.Sxf5#
      • 1...Bd6
        • 2.Sxe6#
      • 1...Bf6
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(c);N_GUARD::P(C)
    • Q(c);N_GUARD,P_PINP(D)::QAB1(I),XQ(c)
    • Q(c);N_GUARD,P_PINP(D)::P(C)
    • B(f);P_SPINS(k),S_CUTR(h)::S(H),XS(i)
    • B(f);OGATEB::QAB(I),XB(f)
    • S(k);OGATE,P_SPINB(f)::B(K),XB(f)
  • Tries
    • Try
      • S(H);CHECK,XS(i)
      • Vars
        • S(k);OGATE,P_SPINB(f),XS(H)::B(K),XB(f)
      • Refutation
        • R(h);XS(H)
    • Try
      • B(J);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XP(C)::QAB1(I)
        • S(i);XS(H)::QAB1(I)
        • B(f);P_PINP(D),P_SPINS(k)::P(C)
        • S(i);::P(C)
        • P(g);::P(C)
      • Refutation
        • B(a);XB(J)
    • Try
      • R(B);CHECK
      • Vars
        • Q(c);XR(B)::P(C)
      • Refutation
        • P(g);XR(B)
  • Actual
    • S(F);
    • Threat
      • P(C)
    • Vars
      • Q(c);OGATE,P_PINP(D),XS(F)::QAB1(I),XQ(c)
      • B(a);XP(C)::S(F),XB(a)
      • S(i);SBLOCK,XS(H)::R(G)
      • B(f);P_SPINS(k),S_CUTQ(c)::S(F),XP(g)
      • B(f);P_SPINS(k),S_CUTR(h)::S(H),XS(i)
      • B(f);OGATEB::QAB(I),XB(f)
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