MESON Chess Problem Database

Problem Display
PID: 136032 (8/3p2K1/6pN/2r1kP1p/4p2p/3RQ3/7b/6Bn w - - 0 1)

Challenger, Alfred Clement

The Field, 1917

(First published on Sat May 12 1917)

8/3p2K1/6pN/2r1kP1p/4p2p/3RQ3/7b/6Bn

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bf4
      • 2.Qd4#
    • 1...Sf2
      • 2.Bxh2#
  • Tries
    • 1.Rd5+?
      • 1...Kxd5
        • 2.Qxc5#
      • 1...Rxd5!
    • 1.Qxc5+?
      • 1...d5
        • 2.Qc7#
      • 1...Kf4!
    • 1.Qg5?
      • threat
        • 2.Sf7#
      • 1...gxf5
        • 2.Qxf5#
      • 1...e3
        • 2.Qxe3#
      • 1...exd3!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Sf7#
      • 1...Sxf2
        • 2.Bxh2#
      • 1...exd3
        • 2.Qd4#
      • 1...gxf5
        • 2.Qxf5#
      • 1...e3
        • 2.Qxe3#
      • 1...Bf4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(b);SBLOCK::QAB1(C)
    • S(a);N_GUARD::B(A),XB(b)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(f);N_SPINP(c),P-FLIGHT,XR(B)::QAR1(C),XR(e)
      • Refutation
        • R(e);XR(B)
    • Try
      • Q(C);CHECK,N_PINP(c),XR(e)
      • Vars
        • P(i);N_GUARD,P_SPINP(i)::QAB(C)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • Q(C);N_PINP(c)
      • Threat
        • S(E)
      • Vars
        • P(h);OGATE,P_SPINP(h),XP(D)::QAR1(C),XP(h)
        • P(c);OGATEB::QAR2(C),XP(c)
      • Refutation
        • P(c);XR(B)
  • Actual
    • Q(C);N_PINP(c)
    • Threat
      • S(E)
    • Vars
      • S(a);N_GUARD,XQ(C)::B(A),XB(b)
      • P(c);XR(B)::QAB1(C)
      • P(h);OGATE,XP(D)::QAR1(C),XP(h)
      • P(c);OGATEB::QAR2(C),XP(c)
      • B(b);SBLOCK::QAB1(C)
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