MESON Chess Problem Database

Problem Display
PID: 272062 (2Q2B2/2qr1p2/2P1k1P1/2p2R2/2N1npB1/2pN2p1/2P1nb2/3KR3 w - - 0 1)

Smedley, Don A

The Problemist, 1957

2Q2B2/2qr1p2/2P1k1P1/2p2R2/2N1npB1/2pN2p1/2P1nb2/3KR3

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qa5
      • 2.Qxd7#
    • 1...Qe5
      • 2.Qxd7#
    • 1...Qb6
      • 2.Qxd7#
    • 1...Qb8
      • 2.Qxd7#
    • 1...Sd4
      • 2.Sxc5#
    • 1...Sd6
      • 2.Sxf4#
    • 1...Sf6
      • 2.Re5#
    • 1...f6
      • 2.Re5#
  • Tries
    • 1.Be7?
      • threat
        • 2.Re5#
      • 1...Kxe7
        • 2.Rxf7#
      • 1...Qe5
        • 2.Rxe5#
        • 2.Qxd7#
      • 1...fxg6!
    • 1.Bg7?
      • threat
        • 2.Re5#
      • 1...Ke7
        • 2.Rxf7#
      • 1...Qe5
        • 2.Rxe5#
        • 2.Qxd7#
      • 1...fxg6!
  • Keys
    • 1.Sb6!
      • threat
        • 2.Rxf7#
      • 1...Qxb6
        • 2.Qxd7#
      • 1...fxg6
        • 2.Rxf4#
      • 1...Qe5
        • 2.Qxd7#
      • 1...Sd4
        • 2.Sxc5#
      • 1...Sd6
        • 2.Sxf4#
      • 1...Sf6
        • 2.Re5#
      • 1...f6
        • 2.Re5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(i);N_GUARD::QAB1(J),XR(j)
    • S(a);N_PINS(D),P_SPINS(e)::S(D),XP(g)
    • S(e);N_PINS(D),P_SPINS(a)::S(D),XP(f)
    • S(e);P_SPINS(a),SBLOCK::B(F)+R(G),DCHECK
    • P(k);SBLOCK::B(F)+R(G),DCHECK
  • Tries
    • Try
      • B(K);
      • Threat
        • B(F)+R(G),DCHECK
      • Vars
        • K(h);N_GUARD,N_SPINR(j),P-FLIGHT,XB(K)::R1(G),XP(k)
      • Refutation
        • P(k);XP(I)
    • Try
      • B(K);
      • Threat
        • B(F)+R(G),DCHECK
      • Vars
        • K(h);N_GUARD,N_SPINR(j),P-FLIGHT::R1(G),XP(k)
      • Refutation
        • P(k);XP(I)
  • Actual
    • S(E);
    • Threat
      • B(F)+R(G),XP(k)
    • Vars
      • Q(i);N_GUARD,XS(E)::QAB1(J),XR(j)
      • P(k);N_GUARD,XP(I)::B(F)+R(G),XP(f)
      • Q(i);N_GUARD::QAB1(J),XR(j)
      • S(a);N_PINS(D),P_SPINS(e)::S(D),XP(g)
      • S(e);N_PINS(D),P_SPINS(a)::S(D),XP(f)
      • S(e);P_SPINS(a),SBLOCK::B(F)+R(G),DCHECK
      • P(k);SBLOCK::B(F)+R(G),DCHECK
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