MESON Chess Problem Database

Problem Display
PID: 228170 (8/K1P1Pr2/Q4P2/3NP3/nP1kpP2/2ppN2R/1prn4/4B3 w - - 0 1)

Papack, Daniel

5th Prize, The Problemist, 2020

8/K1P1Pr2/Q4P2/3NP3/nP1kpP2/2ppN2R/1prn4/4B3

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qc4#
    • 1...Sf1
      • 2.Qc4#
    • 1...Sb3
      • 2.Qc4#
    • 1...Sf3
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
    • 1...Sb6
      • 2.Qxb6#
  • Tries
    • 1.Sb6?
      • threat
        • 2.Sf5#
      • 1...Sxb6
        • 2.Qxb6#
      • 1...Rxf6!
    • 1.Bxd2?
      • threat
        • 2.Qc4#
      • 1...Sb6
        • 2.Qxb6#
      • 1...cxd2!
    • 1.Qb5?
      • threat
        • 2.Sf5#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Rxf6!
    • 1.Qb6+?
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sxb6!
    • 1.Qc6?
      • threat
        • 2.Sf5#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Rxf6!
    • 1.Qd6?
      • threat
        • 2.Sb6#
      • 1...Rxf6
        • 2.Sxf6#
      • 1...Sc4
        • 2.Sf5#
      • 1...Sb6
        • 2.Sxb6#
        • 2.Qc5#
        • 2.Qxb6#
      • 1...Sf3!
  • Keys
    • 1.Sxc3!
      • threat
        • 2.Sb5#
      • 1...Kxc3
        • 2.Qc4#
      • 1...Rxc3
        • 2.Qd6#
      • 1...Sxc3
        • 2.Qb6#
      • 1...Sf3
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(c);N_GUARD::QAR1(H)
    • S(c);N_GUARD::QAR1(H),XS(c)
    • S(f);N_GUARD::QAB(H),XS(f)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(B)
      • Vars
        • S(f);OGATE,XS(F)::QAB(H),XS(f)
      • Refutation
        • R(i);XP(I)
    • Try
      • B(A);XS(c)
      • Threat
        • QAR1(H)
      • Vars
        • S(f);N_GUARD::QAB(H),XS(f)
      • Refutation
        • P(d);XB(A)
    • Try
      • Q(H);
      • Threat
        • S(B)
      • Vars
        • S(f);N_GUARD::QAB1(H),XS(f)
      • Refutation
        • R(i);XP(I)
    • Try
      • Q(H);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAB1(H),XS(f)
      • Refutation
        • S(f);XQ(H)
    • Try
      • Q(H);
      • Threat
        • S(B)
      • Vars
        • S(f);N_GUARD::QAB1(H),XS(f)
      • Refutation
        • R(i);XP(I)
    • Try
      • Q(H);
      • Threat
        • QAR(H)+S(F)
      • Vars
        • R(i);XP(I)::QAR(H)+S(F),XR(i)
        • S(c);SBLOCK::S(B)
      • Refutation
        • S(c);
  • Actual
    • S(F);XP(d)
    • Threat
      • S(F)
    • Vars
      • K(g);P_SPINS(c),S_FLIGHT,XS(F)::QAR1(H)
      • R(b);SBLOCK,XS(F)::QAR2(H)
      • S(f);N_GUARD,SBLOCK,XS(F)::QAB(H)
      • S(c);::S(B)
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