MESON Chess Problem Database

Problem Display
PID: 204256 (8/8/qR6/kpQ5/8/1K6/1P6/8 w - - 0 1)

de Savignac Castelet, G Arnaud

L'Echiquier Marseillais, 1925

8/8/qR6/kpQ5/8/1K6/1P6/8

#2

4 + 3

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Qxb5#
    • 1...Qc8
      • 2.Qxb5#
    • 1...Qxb6
      • 2.Qa3#
    • 1...Qa7
      • 2.Qxb5#
    • 1...Qa8
      • 2.Qxb5#
  • Tries
    • 1.Kc2?
      • 1...Ka4
        • 2.Rxa6#
        • 2.Qa3#
      • 1...Qxb6
        • 2.Qa3#
      • 1...Qb7
        • 2.Qxb5#
      • 1...Qa7
        • 2.Qxb5#
      • 1...Qa8
        • 2.Qxb5#
      • 1...Qc8!
    • 1.Kc3?
      • 1...Ka4
        • 2.Rxa6#
        • 2.Qa3#
        • 2.Qb4#
      • 1...Qxb6
        • 2.Qa3#
      • 1...Qb7
        • 2.Qxb5#
      • 1...Qa7
        • 2.Qxb5#
      • 1...Qa8
        • 2.Qxb5#
      • 1...Qc8!
    • 1.Rc6?
      • threat
        • 2.Qa3#
        • 2.Qb4#
      • 1...Qb6
        • 2.Qa3#
        • 2.Qxb6#
      • 1...Qxc6!
    • 1.Qc3+?
      • 1...b4
        • 2.Qxb4#
      • 1...Kxb6!
    • 1.Qc6?
      • threat
        • 2.Rxa6#
      • 1...Qc8
        • 2.Rxb5#
        • 2.Qxb5#
      • 1...Qb7
        • 2.Qxb5#
      • 1...Qa7
        • 2.Rxb5#
        • 2.Qxb5#
      • 1...Qa8
        • 2.Rxb5#
        • 2.Qxb5#
      • 1...Qxb6!
  • Keys
    • 1.Ka2!
      • 1...Ka4
        • 2.Rxa6#
        • 2.Qa3#
      • 1...Qxb6
        • 2.Qa3#
      • 1...Qb7
        • 2.Qxb5#
      • 1...Qc8
        • 2.Qxb5#
      • 1...Qa7
        • 2.Qxb5#
      • 1...Qa8
        • 2.Qxb5#

This anticipates 15389(1983), 23019(1987)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(c);N_GUARD::QAR1(C),XP(b)
    • Q(c);SBLOCK,XR(D)::QAR2(C)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • Q(c);SBLOCK,XR(D)::QAR2(C)
        • Q(c);N_GUARD::QAR1(C),XP(b)
      • Refutation
        • Q(c);P_PINQ(C)
    • Try
      • K(B);P-FLIGHT
      • Vars
        • Q(c);SBLOCK,XR(D)::QAR2(C)
        • Q(c);N_GUARD::QAR1(C),XP(b)
      • Refutation
        • Q(c);P_PINQ(C)
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Refutation
        • Q(c);XR(D)
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Vars
        • P(b);P_SPINP(b)::QAB1(C),XP(b)
      • Refutation
        • K(a);S_FLIGHT,XR(D)
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • R1(D),XQ(c)
      • Vars
        • Q(c);N_GUARD::QAR1(C),XP(b)
      • Refutation
        • Q(c);XR(D)
  • Actual
    • K(B);S_FLIGHT
    • Vars
      • Q(c);SBLOCK,XR(D)::QAR2(C)
      • Q(c);N_GUARD::QAR1(C),XP(b)
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