MESON Chess Problem Database

Problem Display
PID: 242369 (2K5/1pBR2Pb/n3kr2/R3Pp2/2q2p2/nQ6/8/8 w - - 0 1)

Morra, Juan Carlos

Source?, 1960

2K5/1pBR2Pb/n3kr2/R3Pp2/2q2p2/nQ6/8/8

#2

7 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qxd5#
    • 1...Rf8+
      • 2.gxf8S#
    • 1...Sb1
      • 2.Qxc4#
    • 1...Sc2
      • 2.Qxc4#
    • 1...Sb5
      • 2.Qxc4#
    • 1...Sc5
      • 2.Qb6#
    • 1...b5
      • 2.Rxa6#
  • Tries
    • 1.Rxa6+?
      • 1...b6
        • 2.Rxb6#
      • 1...bxa6!
    • 1.g8Q+?
      • 1...Rf7
        • 2.Qxf7#
      • 1...Bxg8!
    • 1.g8B+?
      • 1...Rf7
        • 2.Bxf7#
      • 1...Bxg8!
  • Keys
    • 1.Kd8!
      • threat
        • 2.Re7#
      • 1...Rf8+
        • 2.gxf8S#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Rf7
        • 2.Rd6#
      • 1...Sb5
        • 2.Qxc4#
      • 1...Sc5
        • 2.Qb6#
      • 1...b5
        • 2.Rxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(b);N_PINB(D),OGATE::QAB1(A),XQ(b)
    • R(g);CHECK,OGATE::PXR(g)=S
    • S(a);N_GUARD::QAB(A),XQ(b)
    • S(e);N_PINB(D)::QAR(A)
    • P(h);N_GUARD::R(B),XS(e)
  • Tries
    • Try
      • R(B);CHECK,XS(e)
      • Vars
        • P(h);P_SPINP(h)::R(B),XP(h)
      • Refutation
        • P(h);XR(B)
    • Try
      • P(F);CHECK
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::QAB1(F),XR(g)
      • Refutation
        • B(i);XQ(F)
    • Try
      • P(F);CHECK
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::B(F),XR(g)
      • Refutation
        • B(i);XB(F)
  • Actual
    • K(G);N_SPINB(D),P-FLIGHT
    • Threat
      • R1(E)
    • Vars
      • R(g);CHECK,OGATE::PXR(g)=S
      • Q(b);OGATE,P_PINR(E)::QAB1(A),XQ(b)
      • R(g);SBLOCK::R1(E)
      • S(a);N_GUARD::QAB(A),XQ(b)
      • S(e);::QAR(A)
      • P(h);N_GUARD::R(B),XS(e)
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