MESON Chess Problem Database

Problem Display
PID: 146385 (2b5/1N6/6nr/1R4n1/2Ppk2r/K2p2qR/8/1BN2QB1 w - - 0 1)

Lipton, Michael

The Problemist, 2012

2b5/1N6/6nr/1R4n1/2Ppk2r/K2p2qR/8/1BN2QB1

#2

9 + 9

5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Sd6#
      • 2.Bxd3#
    • 1...Qh2
      • 2.Bxd3#
    • 1...Qf4
      • 2.Bxd3#
      • 2.Qxd3#
    • 1...Qe5
      • 2.Bxd3#
    • 1...Qd6+
      • 2.Sxd6#
    • 1...Qc7
      • 2.Bxd3#
    • 1...Qb8
      • 2.Bxd3#
    • 1...Qxg1
      • 2.Sd6#
      • 2.Bxd3#
    • 1...Qg2
      • 2.Sd6#
      • 2.Bxd3#
    • 1...Qe3
      • 2.Sd6#
    • 1...Qxh3
      • 2.Sd6#
    • 1...Qg4
      • 2.Sd6#
      • 2.Bxd3#
    • 1...Rf4
      • 2.Sd6#
    • 1...Bf5
      • 2.Qxf5#
    • 1...Bxb7
      • 2.Qf5#
    • 1...Se6
      • 2.Qf5#
    • 1...Se5
      • 2.Sc5#
  • Tries
    • 1.Rxg3?
      • threat
        • 2.Sd6#
        • 2.Bxd3#
      • 1...Bxb7
        • 2.Bxd3#
        • 2.Qf5#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sf7
        • 2.Bxd3#
        • 2.Qf3#
      • 1...Se5
        • 2.Sc5#
      • 1...Se7
        • 2.Bxd3#
      • 1...Sf8
        • 2.Bxd3#
      • 1...Sh8
        • 2.Bxd3#
      • 1...Sf4!
    • 1.Re5+?
      • 1...Qxe5
        • 2.Bxd3#
      • 1...Sxe5
        • 2.Sc5#
      • 1...Kxe5!
    • 1.Qxd3+?
      • 1...Kf4
        • 2.Qxg3#
      • 1...Qxd3+!
    • 1.Qf6?
      • threat
        • 2.Sc5#
      • 1...Qd6+
        • 2.Sxd6#
      • 1...Bxb7
        • 2.Qf5#
      • 1...Rf4
        • 2.Qc6#
      • 1...Bf5
        • 2.Qxf5#
      • 1...Qe5
        • 2.Bxd3#
      • 1...Qc7
        • 2.Bxd3#
        • 2.Qxd4#
      • 1...Se6
        • 2.Qf5#
      • 1...Sf4!
  • Keys
    • 1.Sxd3!
      • threat
        • 2.Sc5#
      • 1...Qd6+
        • 2.Sxd6#
      • 1...Qxd3+
        • 2.Bxd3#
      • 1...Bxb7
        • 2.Qf5#
      • 1...Qf2
        • 2.Sd6#
      • 1...Qf4
        • 2.Sf2#
      • 1...Qe5
        • 2.Sdc5#
      • 1...Qc7
        • 2.Qe2#
        • 2.Qe1#
      • 1...Qf3
        • 2.Sd6#
      • 1...Rf4
        • 2.Sd6#
      • 1...Sf3
        • 2.Qe2#
      • 1...Se6
        • 2.Qf5#
      • 1...Sf4
        • 2.Re5#

Anticipated by 136382(2004)

This is a version of 6446

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::B(A),XP(a)
    • Q(b);CHECK,N_GUARD::S(I),XQ(b)
    • Q(b);N_GUARD::S(I)
    • Q(b);N_GUARD,XR(F)::S(I)
    • R(e);S_CUTQ(b)::S(I)
    • B(i);N_GUARD::QAB1(C),XB(i)
    • B(i);N_GUARD,XS(I)::QAB1(C)
    • S(f);S_CUTB(i)::QAB1(C)
    • S(g);SBLOCK::S(I)
  • Tries
    • Try
      • R(F);XQ(b)
      • Threat
        • DUALS(2)
      • Vars
        • S(f);N_GUARD::QAB1(C),XS(f)
        • S(g);SBLOCK::S(I)
        • S(g);::B(A),XP(a)
      • Refutation
        • S(g);
    • Try
      • R(H);CHECK
      • Vars
        • Q(b);SBLOCK,XR(H)::B(A),XP(a)
        • S(g);SBLOCK,XR(H)::S(I)
      • Refutation
        • K(d);N_SPINP(a),P-FLIGHT,XR(H)
    • Try
      • Q(C);CHECK,P_SPINQ(C),XP(a)
      • Vars
        • K(d);P-FLIGHT::QAB1(C),XQ(b)
      • Refutation
        • Q(b);CHECK,P_SPINQ(b),XQ(C)
    • Try
      • Q(C);
      • Threat
        • S(I)
      • Vars
        • Q(b);CHECK,N_GUARD::S(I),XQ(b)
        • B(i);N_GUARD,XS(I)::QAB1(C)
        • R(e);SBLOCK::QAB(C)
        • B(i);N_GUARD::QAB1(C),XB(i)
        • Q(b);N_GUARD::B(A),XP(a)
        • S(f);S_CUTB(i)::QAB1(C)
      • Refutation
        • S(g);
  • Actual
    • S(B);P_SPINS(B),XP(a)
    • Threat
      • S(I)
    • Vars
      • Q(b);CHECK,N_GUARD,N_PINS(B)::S(I),XQ(b)
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(B)::B(A),XQ(b)
      • B(i);N_GUARD,XS(I)::QAB1(C)
      • Q(b);N_GUARD,N_PINS(B)::S(I)
      • Q(b);N_PINS(B),SBLOCK::B(A)+S(B),DCHECK
      • Q(b);N_GUARD::S(I)
      • R(e);S_CUTQ(b)::S(I)
      • S(f);N_PINS(B),S_CUTQ(b)::QAR2(C)
      • S(f);S_CUTB(i)::QAB1(C)
      • S(g);N_GUARD,S_CUTQ(b)::R1(H)
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