MESON Chess Problem Database

Problem Display
PID: 258465 (1BQR4/1P3p1B/K2P2r1/2Nkp3/1p2RnP1/3p1n2/3pNP2/8 w - - 0 1)

Draper, H Jack

3rd Prize, British Chess Magazine 02. TT, 1986

1BQR4/1P3p1B/K2P2r1/2Nkp3/1p2RnP1/3p1n2/3pNP2/8

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd6+
      • 2.Rxd6#
    • 1...b3
      • 2.Sc3#
  • Tries
    • 1.Sxd3?
      • threat
        • 2.Qc4#
      • 1...Rxd6+
        • 2.Rxd6#
      • 1...Sd4
        • 2.Rxe5#
      • 1...Kxe4!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Qc4#
      • 1...Rxd6+
        • 2.Sb6#
      • 1...Kxe4
        • 2.Sf6#
      • 1...Ke6
        • 2.Sxf4#
      • 1...Sd4
        • 2.Rxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(h);CHECK,OGATE,P_SPINR(h),XP(G)::R1(L),XR(h)
    • P(d);N_GUARD::S(A)
  • Tries
    • Try
      • S(E);XP(b)
      • Threat
        • QAB1(K)
      • Vars
        • R(h);CHECK,OGATE,P_SPINR(h),XP(G)::R1(L),XR(h)
        • S(c);N_GUARD::R1(C),XP(g)
      • Refutation
        • K(f);P_SPINR(h),S_FLIGHT,XR(C)
  • Actual
    • S(E);
    • Threat
      • QAB1(K)
    • Vars
      • R(h);CHECK,XP(G)::S(E)
      • K(f);P_SPINR(h),S_FLIGHT,XR(C)::S(E)
      • K(f);N_GUARD,N_PINP(G),P_SPINP(g),S_FLIGHT::S(A),XS(e)
      • S(c);N_GUARD::R1(C),XP(g)
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