MESON Chess Problem Database

Problem Display
PID: 87888 (7K/pp1p1B2/rqbN3p/BRb3kN/2p3np/4pp1P/5PRn/8 w - - 0 1)

Waidl, Dr Viktor

The Problemist, 1931

7K/pp1p1B2/rqbN3p/BRb3kN/2p3np/4pp1P/5PRn/8

#2

9 + 15

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd8+
      • 2.Bxd8#
    • 1...Qxb5
      • 2.Bd8#
    • 1...Sf1
      • 2.Rxg4#
    • 1...exf2
      • 2.Bd2#
    • 1...e2
      • 2.Bd2#
    • 1...fxg2
      • 2.f4#
  • Tries
    • 1.Bc3?
      • threat
        • 2.Bf6#
      • 1...fxg2
        • 2.f4#
      • 1...Qd8+!
  • Keys
    • 1.Rxc5+!
      • 1...Qxc5
        • 2.Bd8#
      • 1...Bd5
        • 2.Rxd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(j);CHECK,OGATE::B(D),XQ(j)
    • Q(j);N_SPINB(g),OGATE,XR(E)::B(D)
    • S(a);N_GUARD::R1(B),XS(e)
    • P(b);OGATEB,XP(A)::B(D)
    • P(b);OGATEB::B(D)
    • P(c);N_SPINS(e),OGATE,XR(B)::P(A)
  • Tries
    • Try
      • B(D);
      • Threat
        • B(D)
      • Vars
        • P(c);N_SPINS(e),OGATE,XR(B)::P(A)
      • Refutation
        • Q(j);CHECK
  • Actual
    • R(E);CHECK,XB(g)
    • Vars
      • Q(j);OGATE,XR(E)::B(D)
      • B(k);N_GUARD,P_SPINB(k)::R(E),XB(k)
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