MESON Chess Problem Database

Problem Display
PID: 259607 (8/3p4/1b1R2B1/1Qp2p2/1Pb1k1p1/2B1N1P1/1n1PN1p1/4R1K1 w - - 0 1)

Cheylan, Yves

Problem Observer, 1980

8/3p4/1b1R2B1/1Qp2p2/1Pb1k1p1/2B1N1P1/1n1PN1p1/4R1K1

#2

11 + 9

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...cxb4
      • 2.Qxf5#
  • Tries
    • 1.Rd4+?
      • 1...Kf3
        • 2.Rf4#
      • 1...cxd4
        • 2.Qxf5#
      • 1...Ke5!
    • 1.Qxc4+?
      • 1...Kf3
        • 2.Qd5#
        • 2.Qf4#
      • 1...Sxc4!
    • 1.Qc6+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...dxc6!
    • 1.Qxd7?
      • threat
        • 2.Qxf5#
      • 1...Kf3
        • 2.Qxf5#
      • 1...Be6!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Sh4#
      • 1...cxb4+
        • 2.Sfd4#
      • 1...Kf3
        • 2.Sh4#
      • 1...Be6
        • 2.Sed4#
      • 1...Bf7
        • 2.Sed4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(f);OGATE,P_PINS(F),XP(H)::QAB1(I),XP(g)
  • Tries
    • Try
      • R(J);CHECK
      • Vars
        • K(d);N_SPINP(g),OGATE,S_FLIGHT::R1(J)
        • P(f);OGATE,XR(J)::QAB1(I),XP(g)
      • Refutation
        • K(d);N_SPINP(g),P-FLIGHT,P_SPINP(f)
    • Try
      • Q(I);CHECK,XB(c)
      • Refutation
        • S(a);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAB1(I),XB(c)
      • Refutation
        • P(i);XQ(I)
    • Try
      • Q(I);XP(i)
      • Threat
        • QAB1(I),XP(g)
      • Vars
        • K(d);N_SPINP(g),S_FLIGHT::QAR2(I),XP(g)
      • Refutation
        • B(c);
  • Actual
    • S(F);XP(g)
    • Threat
      • B(K)+S(F)
    • Vars
      • P(f);CHECK,XP(H)::B(K)+S(F)
      • K(d);S_FLIGHT::S(F)
      • B(c);N_GUARD::R(A)+S(D)
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