MESON Chess Problem Database

Problem Display
PID: 259246 (1Q3b2/3p4/2BNp1Rp/2K1k3/2PNp1R1/2Pb4/8/4B1q1 w - - 0 1)

Pirrone, Santi

18th Place, 01. WCCT, 1972-1975

1Q3b2/3p4/2BNp1Rp/2K1k3/2PNp1R1/2Pb4/8/4B1q1

#2

10 + 8

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4+
      • 2.cxd4#
    • 1...Qh1
      • 2.Bg3#
    • 1...Qg3
      • 2.Bxg3#
    • 1...Bf1
      • 2.Rxe4#
    • 1...Be2
      • 2.Rxe4#
    • 1...Bxc4
      • 2.Rxe4#
    • 1...Bxd6+
      • 2.Qxd6#
    • 1...Bg7
      • 2.Sf7#
    • 1...e3
      • 2.Sf3#
    • 1...dxc6
      • 2.Rxe6#
  • Tries
    • 1.Kb6?
      • threat
        • 2.Sf7#
      • 1...Bxd6
        • 2.Qh8#
      • 1...Qxd4+!
    • 1.Bxd7?
      • threat
        • 2.Rxe6#
      • 1...Qxd4+
        • 2.cxd4#
      • 1...Bxd6+
        • 2.Qxd6#
      • 1...Bxc4
        • 2.Rxe4#
      • 1...Qxg4!
    • 1.Rxg1?
      • threat
        • 2.Bg3#
      • 1...Bxd6+
        • 2.Qxd6#
      • 1...Kf4!
    • 1.R6g5+?
      • 1...Kf6
        • 2.Qxf8#
      • 1...hxg5!
  • Keys
    • 1.Kb5!
      • threat
        • 2.Sf7#
      • 1...Bxc4+
        • 2.Sxc4#
      • 1...dxc6+
        • 2.Sxc6#
      • 1...Qxd4
        • 2.Bg3#
      • 1...Bxd6
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • Q(a);CHECK,OGATE,P_PINS(H),XS(D)::P(B),XQ(a)
    • Q(a);N_GUARD,N_PINS(D),P_PINS(H)::B(A)
    • Q(a);N_GUARD,N_PINS(D),P_PINS(H)::B(A),XQ(a)
    • B(b);N_GUARD::R1(E),XP(c)
    • B(b);N_GUARD,XP(C)::R1(E),XP(c)
    • B(h);CHECK,OGATE,P_SPINB(h),XS(H)::QAB1(J),XB(h)
    • B(h);::QAB(J)+S(H),DCHECK
    • P(c);N_PINS(D),P_PINS(H)::S(D)
    • P(g);N_GUARD,XB(G)::R1(I),XP(e)
  • Tries
    • Try
      • K(F);S_FLIGHT
      • Threat
        • QAB(J)+S(H),DCHECK
      • Vars
        • B(h);OGATE,P_SPINB(h),SBLOCK,XS(H)::QAB(J)
      • Refutation
        • Q(a);CHECK,XS(D)
    • Try
      • B(G);XP(g)
      • Threat
        • R1(I),XP(e)
      • Vars
        • Q(a);CHECK,OGATE,P_PINS(H),XS(D)::P(B),XQ(a)
        • B(h);CHECK,OGATE,P_SPINB(h),XS(H)::QAB1(J),XB(h)
        • B(b);N_GUARD,XP(C)::R1(E),XP(c)
      • Refutation
        • Q(a);N_PINS(D),P_PINS(H),XR(E)
    • Try
      • R(E);N_SPINS(D),P_SPINS(H),XQ(a)
      • Threat
        • B(A)
      • Vars
        • B(h);CHECK,OGATE,P_SPINB(h),XS(H)::QAB1(J),XB(h)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • R(I);CHECK
      • Vars
        • K(d);S_CUTP(f),S_FLIGHT::QAR2(J),XB(h)
      • Refutation
        • P(f);XR(I)
  • Actual
    • K(F);N_SPINS(D),P-FLIGHT,P_SPINP(C)
    • Threat
      • QAB(J)+S(H),DCHECK
    • Vars
      • B(b);CHECK,XP(C)::QAB(J)+S(H),DCHECK,XB(b)
      • P(g);CHECK,XB(G)::S(D),XP(g)
      • Q(a);N_GUARD,XS(D)::B(A)
      • B(h);OGATE,P_SPINB(h),SBLOCK,XS(H)::QAB(J)
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