MESON Chess Problem Database

Problem Display
PID: 274973 (3R4/3N3p/2n5/r2p2QK/2P1Pp2/3k1N1R/3B4/3B4 w - - 0 1)

Hersom, Donald H

The Problemist, 1933

3R4/3N3p/2n5/r2p2QK/2P1Pp2/3k1N1R/3B4/3B4

#2

10 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Bc2#
    • 1...dxc4
      • 2.Sc5#
    • 1...dxe4
      • 2.Sde5#
  • Tries
    • 1.Sde5+?
      • 1...Kxe4
        • 2.Bc2#
        • 2.Qxf4#
      • 1...Sxe5!
    • 1.Qxd5+?
      • 1...Sd4
        • 2.Sde5#
      • 1...Rxd5+!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qe2#
      • 1...dxc4+
        • 2.Sc5#
      • 1...dxe4+
        • 2.Sde5#
      • 1...d4+
        • 2.Sfe5#
      • 1...Kxc4
        • 2.Qf1#
        • 2.Qe2#
      • 1...Kxe4
        • 2.Bc2#
      • 1...Sd4
        • 2.Sfe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);N_GUARD,S_FLIGHT,XP(F)::B(A)
    • P(d);P_PINQ(G),SBLOCK,XP(E)::R(J)+S(I),DCHECK
    • P(d);P_PINQ(G),SBLOCK,XP(F)::R(J)+S(I),DCHECK
  • Tries
    • Try
      • S(I);CHECK,P_PINP(d)
      • Refutation
        • S(e);XS(I)
    • Try
      • Q(G);CHECK,P_SPINQ(G),XP(d)
      • Vars
        • S(e);P_SPINS(e)::S(I)
      • Refutation
        • R(c);CHECK,XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAB1(G)
    • Vars
      • P(d);CHECK,SBLOCK,XP(E)::R(J)+S(I),DCHECK
      • P(d);CHECK,SBLOCK,XP(F)::R(J)+S(I),DCHECK
      • P(d);CHECK,SBLOCK::R(D)+S(C),DCHECK
      • K(a);N_GUARD,S_FLIGHT,XP(F)::B(A)
      • S(e);SBLOCK::R(D)+S(C),DCHECK
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