MESON Chess Problem Database

Problem Display
PID: 38138 (1Qnr1q2/1KPB1rNR/Rn1kP3/2pP1pP1/p2P4/B7/8/8 w - - 0 1)

Mai, Guglielmo

Mai, Luigi

Die Schwalbe, 1928

1Qnr1q2/1KPB1rNR/Rn1kP3/2pP1pP1/p2P4/B7/8/8

#2

12 + 9

3979 Systematic Terminology 1984
136 Problem Observer 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Ke7
      • 2.Sxf5#
  • Tries
    • 1.cxd8S+?
      • 1...Ke7
        • 2.Sc6#
      • 1...Kxd5!
  • Keys
    • 1.Bc6!
      • threat
        • 2.Bxc5#
      • 1...Rxc7+
        • 2.Qxc7#
      • 1...Ke7
        • 2.Sxf5#
      • 1...Sd7
        • 2.cxd8Q#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(e);N_SPINS(d),S_FLIGHT::S(J),XP(c)
  • Tries
    • Try
      • P(H);CHECK,P_SPINB(I),XR(h)
      • Vars
        • K(e);N_PINB(I),N_SPINS(d),S_FLIGHT::S(H)
      • Refutation
        • K(e);N_SPINP(b),N_SPINS(d),P-FLIGHT,XP(C)
  • Actual
    • B(I);N_PINS(d),P_SPINP(H)
    • Threat
      • B(A),XP(b)
    • Vars
      • R(f);CHECK,OGATE,P_SPINR(f),XP(H)::QAB1(L),XR(f)
      • K(e);N_PINP(H),S_FLIGHT::S(J),XP(c)
      • S(d);N_PINP(H)::PXR(h)=Q
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