MESON Chess Problem Database

Problem Display
PID: 164311 (2B1b3/2p2r2/2p1R3/1N1kpp2/1R2r3/1K1Np3/6Q1/b7 w - - 0 1)

Amos, FJ

The Observer, 1926

(First published on Sun May 23 1926)

2B1b3/2p2r2/2p1R3/1N1kpp2/1R2r3/1K1Np3/6Q1/b7

#2

7 + 10

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rf6
      • 2.Sxc7#
    • 1...Rf8
      • 2.Sxc7#
    • 1...Bc3
      • 2.Sxc3#
    • 1...Bd7
      • 2.Sxc7#
    • 1...f4
      • 2.Qxe4#
  • Tries
    • 1.Rc4?
      • threat
        • 2.Sb4#
        • 2.Rc5#
      • 1...cxb5
        • 2.Sb4#
      • 1...Bd7
        • 2.Sxc7#
      • 1...Bc3
        • 2.Sxc3#
        • 2.Rc5#
      • 1...Bd4
        • 2.Sb4#
      • 1...c5
        • 2.Rxc5#
      • 1...Rd7!
    • 1.Rd4+?
      • 1...exd4
        • 2.Re5#
      • 1...Bxd4!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qc5#
      • 1...Rxb4+
        • 2.Sxb4#
      • 1...Rc4
        • 2.Qxc4#
      • 1...Rd4
        • 2.Rxe5#
      • 1...Rd7
        • 2.Qxc6#
      • 1...Bd7
        • 2.Sxc7#
      • 1...Bc3
        • 2.Sxc3#
      • 1...Bd4
        • 2.Qc4#
      • 1...c5
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • R(i);N_GUARD::S(E),XP(h)
    • B(a);N_GUARD::S(E),XB(a)
    • B(j);S_CUTR(i)::S(E),XP(h)
    • P(f);N_GUARD::QAB1(A),XR(c)
  • Tries
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Vars
        • P(g);XS(E)::S(C)
        • B(j);S_CUTR(i)::S(E),XP(h)
        • B(a);::S(C)
        • P(g);::R1(D),XP(g)
      • Refutation
        • R(i);
    • Try
      • R(D);CHECK
      • Vars
        • P(e);XR(D)::R1(F)
      • Refutation
        • B(a);XR(D)
  • Actual
    • Q(A);N_PINR(c)
    • Threat
      • QAR1(A)
    • Vars
      • R(c);CHECK,XR(D)::S(C),XR(c)
      • R(c);N_GUARD::QAB1(A),XR(c)
      • R(c);N_GUARD,S_CUTB(a)::R1(F),XP(e)
      • R(i);S_CUTB(j)::QAB1(A),XP(g)
      • B(j);S_CUTR(i)::S(E),XP(h)
      • B(a);N_GUARD::S(E),XB(a)
      • B(a);S_CUTR(c)::QAB1(A)
      • P(g);::QAR1(A),XP(g)
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