MESON Chess Problem Database

Problem Display
PID: 156310 (2NK1BB1/2p4p/2k5/2N1Pp2/1R1pp3/r5r1/5b2/7Q w - - 0 1)

Labai, Zoltan

Comm., Best Problems, 2005-2006

2NK1BB1/2p4p/2k5/2N1Pp2/1R1pp3/r5r1/5b2/7Q

#2

8 + 9

4901 Best Problems 2007
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rab3
      • 2.Sa7#
    • 1...Rac3
      • 2.Sa7#
    • 1...Rad3
      • 2.Sa7#
    • 1...Rae3
      • 2.Sa7#
    • 1...Raf3
      • 2.Sa7#
    • 1...Ra7
      • 2.Sxa7#
    • 1...Rgb3
      • 2.Qh6#
    • 1...Rgc3
      • 2.Qh6#
    • 1...Rgd3
      • 2.Qh6#
    • 1...Rge3
      • 2.Qh6#
    • 1...Rgf3
      • 2.Qh6#
    • 1...f4
      • 2.Qxe4#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Se7#
      • 1...Raxb3
        • 2.Sa7#
      • 1...Rgxb3
        • 2.Qh6#
      • 1...Rg7
        • 2.Qc1#
      • 1...Ra8!
    • 1.Sd3?
      • threat
        • 2.Se7#
      • 1...Raxd3
        • 2.Sa7#
      • 1...Rgxd3
        • 2.Qh6#
      • 1...Ra8
        • 2.Qc1#
      • 1...Rg7!
    • 1.Sa4?
      • threat
        • 2.Sa7#
        • 2.Se7#
      • 1...Rxg8
        • 2.Se7#
      • 1...Rg7
        • 2.Sa7#
      • 1...d3
        • 2.Se7#
      • 1...Rxa4!
    • 1.Sxe4?
      • threat
        • 2.Se7#
      • 1...fxe4
        • 2.Qxe4#
      • 1...Ra8
        • 2.Sxg3#
      • 1...Rg7!
    • 1.Sa6?
      • threat
        • 2.Sb8#
        • 2.Sa7#
        • 2.Se7#
      • 1...Rxg8
        • 2.Se7#
      • 1...Rg7
        • 2.Sb8#
        • 2.Sa7#
      • 1...d3
        • 2.Sb8#
        • 2.Se7#
      • 1...Rxa6!
    • 1.Sd7?
      • threat
        • 2.Sb8#
        • 2.Se7#
      • 1...Rxg8
        • 2.Se7#
      • 1...Rg7
        • 2.Sb8#
      • 1...Ra8!
    • 1.Qxh7?
      • threat
        • 2.Qxc7#
        • 2.Qd7#
      • 1...Rxg8
        • 2.Qd7#
      • 1...Ra7
        • 2.Sxa7#
        • 2.Qd7#
      • 1...Rg7!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Se7#
      • 1...Rg7
        • 2.Sb3#
      • 1...Rac3
        • 2.Sa7#
      • 1...Ra8
        • 2.Sd3#
      • 1...Rgc3
        • 2.Qh6#

Anticipated by 177807(1984)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 10
  • Sets
    • R(b);N_GUARD::S(E)
    • R(b);N_GUARD,N_SPINP(e)::S(E)
    • R(b);N_GUARD::S(E),XR(b)
    • R(c);N_GUARD::QAR(A)
    • R(c);N_GUARD,N_SPINP(e)::QAR(A)
    • P(f);N_GUARD::QAB(A),XP(e)
  • Tries
    • Try
      • S(C);
      • Threat
        • S(E)
      • Vars
        • R(b);N_GUARD,XS(C)::S(E)
        • R(c);N_GUARD,XS(C)::QAR(A)
        • R(c);N_GUARD::QAR(A)
      • Refutation
        • R(b);P_PINS(E)
    • Try
      • S(C);
      • Threat
        • S(E)
      • Vars
        • R(b);N_GUARD,XS(C)::S(E)
        • R(c);N_GUARD,XS(C)::QAR(A)
        • R(b);N_GUARD,P_PINS(E)::QAR(A)
      • Refutation
        • R(c);
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);P_PINB(G),XB(H)::S(E)
        • R(c);::S(E)
        • P(d);::S(E)
      • Refutation
        • R(b);XS(C)
    • Try
      • S(C);XP(e)
      • Threat
        • S(E)
      • Vars
        • P(f);OGATE,P_SPINP(f),XS(C)::QAB(A),XP(f)
        • R(b);N_GUARD,P_PINS(E)::QAB(A)+S(C),XR(c)
      • Refutation
        • R(c);
    • Try
      • S(C);
      • Threat
        • DUALS(3)
      • Vars
        • R(c);P_PINB(G),XB(H)::S(E)
      • Refutation
        • R(b);XS(C)
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);P_PINB(G),XB(H)::S(E)
        • R(c);::S(C)
      • Refutation
        • R(b);P_PINS(E)
    • Try
      • Q(A);N_PINP(e),XP(i)
      • Threat
        • DUALS(2)
      • Vars
        • R(c);P_PINB(G),XB(H)::QAB1(A)
      • Refutation
        • R(c);
  • Actual
    • Q(A);N_PINP(e)
    • Threat
      • S(E)
    • Vars
      • R(c);N_GUARD::QAR(A)+S(C)
      • R(b);N_GUARD::S(E)
      • R(b);N_GUARD,P_PINS(E)::QAR(A)+S(C)
      • R(c);N_GUARD::QAR(A)
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