MESON Chess Problem Database

Problem Display
PID: 135772 (1b5q/P2PPp2/5Bp1/R2b2N1/4pkPQ/2n1p1NP/4n1P1/K7 w - - 0 1)

Avner, Uri

1st Place, Match: Israel - Serbia, 2008-2009

1b5q/P2PPp2/5Bp1/R2b2N1/4pkPQ/2n1p1NP/4n1P1/K7

#2

12 + 10

721 Variantim 2009
56 The Problemist 2011
17424 Close Encounters with the Chess Pieces (Avner) 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qg7
      • 2.axb8Q#
      • 2.axb8B#
    • 1...Qxh4
      • 2.axb8Q#
      • 2.axb8B#
    • 1...Qh5
      • 2.gxh5#
      • 2.axb8Q#
      • 2.axb8B#
    • 1...Qh6
      • 2.axb8Q#
      • 2.axb8B#
    • 1...Qh7
      • 2.axb8Q#
      • 2.axb8B#
    • 1...Sb1
      • 2.Sxe2#
    • 1...Sd1
      • 2.Sxe2#
    • 1...Sa2
      • 2.Sxe2#
    • 1...Sa4
      • 2.Sxe2#
    • 1...Sb5
      • 2.Sxe2#
  • Tries
    • 1.Sh5+?
      • 1...Qxh5
        • 2.axb8Q#
        • 2.axb8B#
      • 1...gxh5!
    • 1.Sf3?
      • threat
        • 2.Bg5#
      • 1...Qxf6
        • 2.g5#
      • 1...Qxh4
        • 2.axb8Q#
        • 2.axb8B#
      • 1...Qh5
        • 2.gxh5#
      • 1...Qh6
        • 2.axb8Q#
        • 2.axb8B#
      • 1...Sb1
        • 2.Sxe2#
      • 1...Sd1
        • 2.Sxe2#
      • 1...Sa2
        • 2.Sxe2#
      • 1...Sa4
        • 2.Sxe2#
      • 1...Sb5
        • 2.Sxe2#
      • 1...g5
        • 2.Bxg5#
      • 1...exf3!
    • 1.S5xe4?
      • threat
        • 2.Qg5#
      • 1...Qxf6
        • 2.Qxf6#
      • 1...Qxh4
        • 2.axb8Q#
        • 2.axb8B#
      • 1...Bxe4
        • 2.Bg5#
      • 1...Sxe4
        • 2.Sxe2#
      • 1...Qh5
        • 2.gxh5#
      • 1...Qh6
        • 2.axb8Q#
        • 2.axb8B#
      • 1...g5
        • 2.Qxg5#
      • 1...Sxg3!
    • 1.Se6+?
      • 1...Bxe6
        • 2.Bg5#
      • 1...fxe6!
    • 1.Sh7?
      • threat
        • 2.g5#
      • 1...Qxh7
        • 2.axb8Q#
        • 2.axb8B#
      • 1...Sxg3
        • 2.Qg5#
      • 1...Be6
        • 2.Bg5#
      • 1...g5
        • 2.Sh5#
      • 1...Qxf6!
  • Keys
    • 1.Sxf7!
      • threat
        • 2.Bg5#
      • 1...Qxf6
        • 2.g5#
      • 1...Qxh4
        • 2.axb8Q#
        • 2.axb8B#
      • 1...Qh5
        • 2.gxh5#
      • 1...Qh6
        • 2.axb8Q#
        • 2.axb8B#
      • 1...Sb1
        • 2.Sxe2#
      • 1...Sd1
        • 2.Sxe2#
      • 1...Sa2
        • 2.Sxe2#
      • 1...Sa4
        • 2.Sxe2#
      • 1...Sb5
        • 2.Sxe2#
      • 1...g5
        • 2.Bxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(j);N_GUARD::PXB(i)=Q
    • Q(j);N_GUARD,XQ(F)::PXB(i)=Q
    • S(b);N_GUARD,P_PINB(I)::S(C),XS(a)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • Q(j);XS(C)::PXB(i)=Q
      • Refutation
        • P(g);XS(C)
    • Try
      • S(H);
      • Threat
        • B(I)
      • Vars
        • Q(j);N_GUARD,XB(I)::QAR(F)+P(E)
        • Q(j);N_GUARD,XQ(F)::PXB(i)=Q
        • Q(j);OGATE::QAR(F)+P(E),XQ(j)
        • Q(j);N_GUARD::PXB(i)=Q
        • S(b);N_GUARD,P_PINB(I)::S(C),XS(a)
        • P(g);::B(I),XP(g)
      • Refutation
        • P(d);XS(H)
    • Try
      • S(H);XP(d)
      • Threat
        • QAB1(F)
      • Vars
        • Q(j);OGATE,XB(I)::QAR2(F),XQ(j)
        • Q(j);N_GUARD,XQ(F)::PXB(i)=Q
        • B(f);XS(H)::B(I)
        • S(b);N_GUARD,P_PINB(I),SBLOCK,XS(H)::S(C),XS(a)
        • Q(j);OGATE::QAR(F)+P(E),XQ(j)
        • Q(j);N_GUARD::PXB(i)=Q
        • P(g);::QAB1(F),XP(g)
      • Refutation
        • S(a);XS(C)
    • Try
      • S(H);CHECK
      • Vars
        • B(f);XS(H)::B(I)
      • Refutation
        • P(h);XS(H)
    • Try
      • S(H);
      • Threat
        • QAR(F)+P(E)
      • Vars
        • Q(j);N_GUARD,XS(H)::PXB(i)=Q
        • S(a);SBLOCK,XS(C)::QAB1(F)
        • B(f);::B(I)
        • P(g);N_GUARD::S(C)
      • Refutation
        • Q(j);XB(I)
  • Actual
    • S(H);XP(h)
    • Threat
      • B(I)
    • Vars
      • Q(j);N_GUARD,XB(I)::QAR(F)+P(E)
      • Q(j);N_GUARD,XQ(F)::PXB(i)=Q
      • Q(j);OGATE::QAR(F)+P(E),XQ(j)
      • Q(j);N_GUARD::PXB(i)=Q
      • S(b);N_GUARD,P_PINB(I)::S(C),XS(a)
      • P(g);::B(I),XP(g)
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