MESON Chess Problem Database

Problem Display
PID: 96700 (rNR4b/q1r1pB1K/Pp1p2p1/Npk3B1/2p1P3/2R1P2b/1Q6/8 w - - 0 1)

Shaw, EH

The Chess Problem, 1944

rNR4b/q1r1pB1K/Pp1p2p1/Npk3B1/2p1P3/2R1P2b/1Q6/8

#2

11 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa6
      • 2.Rxc7#
    • 1...Qb7
      • 2.Sxb7#
    • 1...Rc6
      • 2.Rxc6#
    • 1...Bf1
      • 2.Sd7#
    • 1...Bg2
      • 2.Sd7#
    • 1...Bd7
      • 2.Sxd7#
    • 1...d5
      • 2.Bxe7#
    • 1...e6
      • 2.Sd7#
  • Tries
    • 1.Be8?
      • threat
        • 2.Qxb5#
      • 1...e6+
        • 2.Sd7#
      • 1...Qxa6
        • 2.Rxc7#
      • 1...d5
        • 2.Bxe7#
      • 1...Rc6
        • 2.Rxc6#
      • 1...Bd7
        • 2.Sxd7#
      • 1...b4
        • 2.Sb3#
        • 2.Rxc4#
      • 1...e5+!
  • Keys
    • 1.Bxc4!
      • threat
        • 2.Qxb5#
      • 1...e5+
        • 2.Bf7#
      • 1...e6+
        • 2.Sd7#
      • 1...Qxa6
        • 2.Rxc7#
      • 1...bxc4
        • 2.Rxc4#
      • 1...d5
        • 2.Bxe7#
      • 1...Bd7
        • 2.Sxd7#
      • 1...b4
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(h);N_GUARD,XP(G)::R(K),XR(i)
    • Q(h);N_GUARD::S(E),XQ(h)
    • R(i);OGATE::R1(K),XR(i)
    • B(a);N_GUARD::S(J)
    • B(a);N_GUARD::S(J),XB(a)
    • P(f);OGATEB::B(F),XP(j)
    • P(j);P_PINB(H),S_CUTB(a)::S(J)
  • Tries
    • Try
      • B(H);
      • Threat
        • QAR1(A),XP(c)
      • Vars
        • P(j);CHECK,S_CUTB(a)::S(J)
        • Q(h);N_GUARD,XP(G)::R(K),XR(i)
        • P(f);OGATEB::B(F),XP(j)
        • R(i);OGATE::R1(K),XR(i)
        • B(a);N_GUARD::S(J),XB(a)
      • Refutation
        • P(j);CHECK
  • Actual
    • B(H);XP(b)
    • Threat
      • QAR1(A),XP(c)
    • Vars
      • P(j);CHECK,S_CUTB(l)::R(B)+B(H)
      • P(j);CHECK,S_CUTB(a)::S(J)
      • Q(h);N_GUARD,XP(G)::R(K),XR(i)
      • P(c);OGATE,P_SPINP(c),XB(H)::R1(B),XP(c)
      • P(f);OGATEB::B(F),XP(j)
      • B(a);N_GUARD::S(J),XB(a)
      • P(c);SBLOCK::S(E)
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