MESON Chess Problem Database

Problem Display
PID: 136627 (4R3/8/8/nK1kB3/8/3prP2/8/3Q4 w - - 0 1)

Gamza, Grigory Stepanovich

3rd HM., Boletim da UBP, 1993

4R3/8/8/nK1kB3/8/3prP2/8/3Q4

#2

5 + 4

6490 yacpdb 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Qxd3#
    • 1...Re2
      • 2.Qxd3#
    • 1...Rxf3
      • 2.Qxf3#
    • 1...Rxe5
      • 2.Qxd3#
    • 1...Sb3
      • 2.Qxb3#
    • 1...Sc6
      • 2.Qb3#
    • 1...Sb7
      • 2.Qb3#
  • Tries
    • 1.Qb3+?
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sxb3!
    • 1.Qa4?
      • threat
        • 2.Qd4#
      • 1...Re4
        • 2.Qxe4#
        • 2.fxe4#
      • 1...Sb3
        • 2.Qxb3#
        • 2.Qc4#
        • 2.Qa8#
      • 1...Sc4
        • 2.Qxc4#
        • 2.Qa8#
      • 1...Sc6
        • 2.Qb3#
        • 2.Qa2#
        • 2.Qc4#
      • 1...Rxe5!
    • 1.Qa1?
      • threat
        • 2.Qd4#
      • 1...Rxe5
        • 2.Qxe5#
      • 1...Sb3
        • 2.Qa8#
      • 1...Sc6
        • 2.Qa2#
      • 1...Re4!
    • 1.Qc1?
      • threat
        • 2.Qc5#
      • 1...Sb3
        • 2.Qc4#
        • 2.Qc6#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sb7
        • 2.Qc4#
        • 2.Qc6#
      • 1...Rxf3!
  • Keys
    • 1.Qg1!
      • threat
        • 2.Qg8#
      • 1...Rxf3
        • 2.Qd4#
      • 1...Rxe5
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • R(b);N_GUARD::QAR2(A),XP(a)
    • R(b);OGATE,XP(B)::QAB(A),XR(b)
    • R(b);N_GUARD,XB(D)::QAR2(A),XP(a)
    • S(c);N_GUARD::QAB(A),XS(c)
    • S(c);N_GUARD::QAB(A)
  • Tries
    • Try
      • Q(A);CHECK,N_PINP(a)
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(A),XS(c)
      • Refutation
        • S(c);XQ(A)
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • QAR1(A)
      • Refutation
        • R(b);XB(D)
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • QAR1(A)
      • Vars
        • R(b);OGATE,XB(D)::QAR1(A),XR(b)
        • S(c);OGATE::QAB(A)
        • S(c);N_GUARD::QAB(A)
      • Refutation
        • R(b);
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • QAR1(A)
      • Vars
        • S(c);N_GUARD::QAB1(A),XS(c)
      • Refutation
        • R(b);XP(B)
  • Actual
    • Q(A);N_PINP(a)
    • Threat
      • QAB(A)
    • Vars
      • R(b);OGATE,XP(B)::QAR1(A)
      • R(b);OGATE,XB(D)::QAR1(A)
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