MESON Chess Problem Database

Problem Display
PID: 11469 (8/8/2qRrp2/p1P2B2/2pNpB2/2Pk2KR/1PpNpnbP/7r w - - 0 1)

Allen, Frederick B

Chess, 1939

8/8/2qRrp2/p1P2B2/2pNpB2/2Pk2KR/1PpNpnbP/7r

#2

11 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Sxe6#
    • 1...Qb5
      • 2.Sxe6#
    • 1...Qe8
      • 2.Sxe6#
    • 1...Qc8
      • 2.Sxe6#
    • 1...Re7
      • 2.Sxc6#
    • 1...Re8
      • 2.Sxc6#
  • Tries
    • 1.Kxf2+?
      • 1...Bf3
        • 2.Rxf3#
      • 1...Bxh3!
    • 1.Sxe6+?
      • 1...Qd5
        • 2.Rxd5#
      • 1...Qxd6!
  • Keys
    • 1.Sxe4!
      • threat
        • 2.Sxf2#
      • 1...Sxe4+
        • 2.Kxg2#
      • 1...Qxe4
        • 2.Sxe6#
      • 1...Rxe4
        • 2.Sxc6#
      • 1...Bxe4
        • 2.Kxf2#
      • 1...Sxh3
        • 2.Sf2#
      • 1...Sd1
        • 2.Sf2#
      • 1...Sg4
        • 2.Sf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 6
  • Sets
    • Q(j);N_GUARD::R(K)+S(G),XR(k)
    • R(k);N_GUARD::R(K)+S(G),XQ(j)
  • Tries
    • Try
      • K(E);CHECK,S_FLIGHT,XS(d)
      • Vars
        • B(e);N_GUARD,P_SPINB(e)::R(F),XB(e)
      • Refutation
        • B(e);XR(F)
    • Try
      • S(G);CHECK,XR(k)
      • Vars
        • Q(j);N_GUARD,P_SPINQ(j)::R(K),XQ(j)
      • Refutation
        • Q(j);P_PINB(H),XR(K)
  • Actual
    • S(B);XP(h)
    • Threat
      • B(J)+S(B),DCHECK,XS(d)
    • Vars
      • S(d);CHECK,N_GUARD,P_SPINS(d),XS(B)::R(F)+K(E),XB(e)
      • Q(j);N_GUARD,P_SPINQ(j),XS(B)::R(K)+S(G),XR(k)
      • R(k);N_GUARD,P_SPINR(k),XS(B)::R(K)+S(G),XQ(j)
      • B(e);N_GUARD,P_SPINB(e),XS(B)::R(F)+K(E),XS(d)
      • S(d);XR(F)::B(J)+S(B),DCHECK
      • S(d);::B(J)+S(B),DCHECK
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