MESON Chess Problem Database

Problem Display
PID: 260971 (8/3pR1PB/4NrNB/1QP5/r3kP2/pP4pn/2PPppb1/2K1n3 w - - 0 1)

Schaffner, Gerold

Neue Zurcher Zeitung, 2008

8/3pR1PB/4NrNB/1QP5/r3kP2/pP4pn/2PPppb1/2K1n3

#2

13 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Se5#
    • 1...Kd5
      • 2.Qb7#
    • 1...Sd3+
      • 2.Qxd3#
    • 1...Sf3
      • 2.Qd3#
  • Tries
    • 1.Qxe2+?
      • 1...Kf5
        • 2.Sh4#
      • 1...Kd5!
    • 1.Qxa4+?
      • 1...Kf3
        • 2.Se5#
      • 1...Kd5
        • 2.Qa8#
      • 1...Kf5!
  • Keys
    • 1.Qxd7!
      • threat
        • 2.Sg5#
      • 1...Sd3+
        • 2.Qxd3#
      • 1...Kf3
        • 2.Se5#
      • 1...Kf5
        • 2.Sd4#
      • 1...Rxe6
        • 2.Sh4#
      • 1...Rxg6
        • 2.Sd4#
      • 1...Sg5
        • 2.Sxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • K(i);N_GUARD,S_CUTR(j),S_CUTR(j),S_FLIGHT::S(I)
    • K(i);N_GUARD,S_CUTP(k),S_FLIGHT::QAB(F)
    • S(a);CHECK,N_GUARD::QAB1(F),XS(a)
    • S(a);N_GUARD::QAB1(F)
  • Tries
    • Try
      • Q(F);CHECK,XP(b)
      • Vars
        • K(i);N_GUARD,S_FLIGHT::B(M)+S(I),DCHECK
      • Refutation
        • K(i);S_FLIGHT
    • Try
      • Q(F);CHECK,XR(h)
      • Vars
        • K(i);N_GUARD,S_FLIGHT::S(I)
        • K(i);N_GUARD,S_CUTP(k),S_FLIGHT::QAB(F)
      • Refutation
        • K(i);S_FLIGHT
  • Actual
    • Q(F);XP(k)
    • Threat
      • R(K)+S(H),DCHECK
    • Vars
      • S(a);CHECK,N_GUARD::QAB1(F),XS(a)
      • K(i);S_CUTR(j),S_CUTR(j),S_FLIGHT::S(I)
      • K(i);S_FLIGHT::QAB(F)+S(H),DCHECK
      • R(j);N_GUARD,P_SPINR(j),XS(H)::B(M)+S(I)
      • R(j);N_GUARD,P_SPINR(j),XS(I)::R(K)+S(H)
      • S(g);::R(K)+S(H),DCHECK,XS(g)
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