MESON Chess Problem Database

Problem Display
PID: 6574 (2Q1N3/6B1/1KR5/1p1rN1qp/2pk4/n3pP2/1P2P3/8 w - - 0 1)

Keres, Paul P

2nd HM., Ajan Sana, 1932

2Q1N3/6B1/1KR5/1p1rN1qp/2pk4/n3pP2/1P2P3/8

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe5
      • 2.Rd6#
      • 2.Qd7#
    • 1...Rd6
      • 2.Rxd6#
    • 1...Rd7
      • 2.Qxd7#
    • 1...c3
      • 2.bxc3#
  • Tries
    • 1.Rxc4+?
      • 1...bxc4
        • 2.Sc6#
      • 1...Sxc4+!
  • Keys
    • 1.Rf6!
      • threat
        • 2.Sc6#
      • 1...Rd6+
        • 2.Rxd6#
      • 1...Kxe5
        • 2.Rf5#
      • 1...Qxe5
        • 2.Rf4#
      • 1...Rxe5
        • 2.Rd6#
      • 1...Rc5
        • 2.Qxc5#
      • 1...Rd7
        • 2.Qc5#
      • 1...Rd8
        • 2.Qc5#
      • 1...c3
        • 2.Qxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(f);OGATEB,P_PINR(F)::R(F),XR(f)
    • R(f);OGATEB::QAR(H),XR(f)
    • P(c);OGATE::P(A),XP(c)
  • Tries
    • Try
      • R(F);CHECK,XP(c)
      • Vars
        • P(e);SBLOCK,XR(F)::B(G)+S(D),DCHECK
      • Refutation
        • S(a);CHECK,XR(F)
  • Actual
    • R(F);
    • Threat
      • S(D)
    • Vars
      • R(f);CHECK,OGATEB::R(F),XR(f)
      • K(d);OGATEB,S_FLIGHT,XS(D)::B(G)+R(F),DCHECK
      • Q(g);N_GUARD,XS(D)::R(F)
      • R(f);OGATEB,XS(D)::R(F)
      • R(f);N_GUARD::QAB1(H),XR(f)
      • R(f);N_GUARD::QAB1(H)
      • P(c);OGATE::QAB1(H),XP(c)
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