MESON Chess Problem Database

Problem Display
PID: 59529 (1B1R2K1/nn2N1Rp/1p2k1P1/3pP1p1/1Q2p3/1p1B3N/5bq1/3b4 w - - 0 1)

Basisty, Mark Borisovich

1st Place, Moscow Championship, 2003

1B1R2K1/nn2N1Rp/1p2k1P1/3pP1p1/1Q2p3/1p1B3N/5bq1/3b4

#2

10 + 12

56 The Problemist 2005
136 Problem Observer 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Sxg5#
    • 1...Qh1
      • 2.Sxg5#
    • 1...Qf3
      • 2.Sxg5#
    • 1...Qh2
      • 2.Sxg5#
    • 1...Bg4
      • 2.Sxg5#
    • 1...Bg3
      • 2.Sxg5#
    • 1...Sa5
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sxd8
      • 2.Qd6#
    • 1...e3
      • 2.Bf5#
    • 1...d4
      • 2.Bc4#
      • 2.Qc4#
    • 1...g4
      • 2.Sf4#
      • 2.Sg5#
    • 1...hxg6
      • 2.Rxg6#
  • Tries
    • 1.Bc4?
      • threat
        • 2.Bxd5#
      • 1...Sxd8
        • 2.Qd6#
      • 1...dxc4
        • 2.Qxc4#
      • 1...Sd6
        • 2.Qxd6#
      • 1...e3!
    • 1.Bxe4?
      • threat
        • 2.Bf5#
      • 1...Qxh3
        • 2.Bxd5#
      • 1...Qxe4
        • 2.Sxg5#
      • 1...dxe4
        • 2.Qc4#
      • 1...hxg6
        • 2.Rxg6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Qf3
        • 2.Sxg5#
      • 1...Qg4
        • 2.Bxd5#
      • 1...Bg4
        • 2.Sxg5#
      • 1...Bc2!
    • 1.Rd6+?
      • 1...Sxd6
        • 2.Qxd6#
      • 1...Kxe5!
    • 1.Qc4?
      • threat
        • 2.Qxd5#
      • 1...dxc4
        • 2.Bxc4#
      • 1...e3
        • 2.Bf5#
      • 1...exd3!
  • Keys
    • 1.Qxe4!
      • threat
        • 2.Qf5#
      • 1...Qxh3
        • 2.Qxd5#
      • 1...Qxe4
        • 2.Sxg5#
      • 1...dxe4
        • 2.Bc4#
      • 1...hxg6
        • 2.Qxg6#
      • 1...Qf3
        • 2.Sxg5#
      • 1...Qg4
        • 2.Qxd5#
      • 1...Bg4
        • 2.Sxg5#
      • 1...Sd6
        • 2.Rxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(c);N_GUARD::S(B),XP(g)
    • B(a);S_CUTQ(c)::S(B),XP(g)
    • B(b);S_CUTQ(c)::S(B),XP(g)
    • S(k);N_GUARD::QAR1(C)
    • S(k);N_GUARD::QAR1(C),XS(k)
    • S(k);N_GUARD,XR(I)::QAR1(C)
    • P(e);OGATE::B(A)
    • P(l);OGATE,XP(E)::R(G),XP(l)
  • Tries
    • Try
      • B(A);P_PINP(f)
      • Threat
        • B(A),XP(f)
      • Vars
        • S(k);N_GUARD,XR(I)::QAR1(C)
        • P(f);N_SPINP(f),OGATE,XB(A)::QAB(C),XP(f)
        • S(k);N_GUARD::QAR1(C),XS(k)
      • Refutation
        • P(e);
    • Try
      • B(A);XP(e)
      • Threat
        • B(A)
      • Vars
        • Q(c);N_GUARD,XS(B)::B(A),XP(f)
        • Q(c);N_GUARD,XB(A)::S(B),XP(g)
        • P(f);OGATEB,XB(A)::QAB(C)
        • P(l);OGATE,XP(E)::R(G),XP(l)
        • S(k);N_GUARD::QAR1(C),XS(k)
        • Q(c);N_GUARD::S(B),XP(g)
        • Q(c);N_GUARD::B(A),XP(f)
        • B(a);S_CUTQ(c)::S(B),XP(g)
      • Refutation
        • B(a);
    • Try
      • R(I);CHECK
      • Vars
        • S(k);OGATE,XR(I)::QAR1(C),XS(k)
      • Refutation
        • K(i);P-FLIGHT,XP(D)
    • Try
      • Q(C);P_PINP(f)
      • Threat
        • QAB1(C),XP(f)
      • Vars
        • P(f);N_SPINP(f),OGATE,XQ(C)::B(A),XP(f)
        • P(e);OGATE::B(A)
      • Refutation
        • P(e);XB(A)
  • Actual
    • Q(C);XP(e)
    • Threat
      • QAB1(C)
    • Vars
      • Q(c);N_GUARD,XS(B)::QAB1(C),XP(f)
      • Q(c);N_GUARD,XQ(C)::S(B),XP(g)
      • P(f);OGATEB,XQ(C)::B(A)
      • P(l);OGATE,XP(E)::QAR2(C),XP(l)
      • Q(c);N_GUARD::S(B),XP(g)
      • Q(c);N_GUARD::QAB1(C),XP(f)
      • B(a);S_CUTQ(c)::S(B),XP(g)
      • S(k);N_GUARD::R1(I),XS(k)
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